Photographing lens assembly, image capturing unit and electronic device

ABSTRACT

A photographing lens assembly includes eight lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The sixth lens element has an image-side surface being concave in a paraxial region thereof. The seventh lens element has an image-side surface being concave in a paraxial region thereof. The eighth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the eighth lens element has at least one critical point in an off-axis region thereof.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 108120290, filedon Jun. 12, 2019, which is incorporated by reference herein in itsentirety.

BACKGROUND Technical Field

The present disclosure relates to a photographing lens assembly, animage capturing unit and an electronic device, more particularly to aphotographing lens assembly and an image capturing unit applicable to anelectronic device.

Description of Related Art

With the development of semiconductor manufacturing technology, theperformance of image sensors has been improved, and the pixel sizethereof has been scaled down. Therefore, featuring high image qualitybecomes one of the indispensable features of an optical system nowadays.

Furthermore, due to the rapid changes in technology, electronic devicesequipped with optical systems are trending towards multi-functionalityfor various applications, and therefore the functionality requirementsfor the optical systems have been increasing. However, it is difficultfor a conventional optical system to obtain a balance among therequirements such as high image quality, low sensitivity, a properaperture size, miniaturization and a desirable field of view.

SUMMARY

According to one aspect of the present disclosure, a photographing lensassembly includes eight lens elements. The eight lens elements are, inorder from an object side to an image side, a first lens element, asecond lens element, a third lens element, a fourth lens element, afifth lens element, a sixth lens element, a seventh lens element and aneighth lens element.

The first lens element with positive refractive power has an object-sidesurface being convex in a paraxial region thereof. The sixth lenselement has an image-side surface being concave in a paraxial regionthereof. The seventh lens element has an image-side surface beingconcave in a paraxial region thereof. The eighth lens element withnegative refractive power has an image-side surface being concave in aparaxial region thereof, and the image-side surface of the eighth lenselement has at least one critical point in an off-axis region thereof.

When a central thickness of the first lens element is CT1, a maximumvalue among central thicknesses of the second through eighth lenselements is MaxCT28, a curvature radius of the image-side surface of theseventh lens element is R14, a curvature radius of an object-sidesurface of the eighth lens element is R15, an axial distance between anobject-side surface of the third lens element and an image-side surfaceof the fifth lens element is Dr5r10, and an axial distance between anobject-side surface of the sixth lens element and the image-side surfaceof the eighth lens element is Dr11r16, the following conditions aresatisfied:

1.0<CT1/MaxCT28;

R14/R15<1.20; and

Dr5r10/Dr11r16<0.90.

According to another aspect of the present disclosure, a photographinglens assembly includes eight lens elements. The eight lens elements are,in order from an object side to an image side, a first lens element, asecond lens element, a third lens element, a fourth lens element, afifth lens element, a sixth lens element, a seventh lens element and aneighth lens element.

The first lens element with positive refractive power has an object-sidesurface being convex in a paraxial region thereof. The sixth lenselement has an image-side surface being concave in a paraxial regionthereof. The seventh lens element with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Theeighth lens element with negative refractive power has an image-sidesurface being concave in a paraxial region thereof, and the image-sidesurface of the eighth lens element has at least one critical point in anoff-axis region thereof.

When a central thickness of the first lens element is CT1, a maximumvalue among central thicknesses of the second through eighth lenselements is MaxCT28, a curvature radius of the image-side surface of theseventh lens element is R14, a curvature radius of an object-sidesurface of the eighth lens element is R15, an axial distance between anobject-side surface of the third lens element and an image-side surfaceof the fifth lens element is Dr5r10, and an axial distance between anobject-side surface of the sixth lens element and the image-side surfaceof the eighth lens element is Dr11r16, the following conditions aresatisfied:

1.0<CT1/MaxCT28;

R14/R15<1.20; and

Dr5r10/Dr11r16<1.0.

According to another aspect of the present disclosure, an imagecapturing unit includes one of the aforementioned photographing lensassemblies and an image sensor, wherein the image sensor is disposed onan image surface of the photographing lens assembly.

According to another aspect of the present disclosure, an electronicdevice includes the aforementioned image capturing unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a perspective view of an image capturing unit according tothe 10th embodiment of the present disclosure;

FIG. 20 is a front view of an electronic device according to the 11thembodiment of the present disclosure;

FIG. 21 is a rear view of an electronic device according to the 12thembodiment of the present disclosure;

FIG. 22 is a rear view of an electronic device according to the 13thembodiment of the present disclosure;

FIG. 23 is a rear view of an electronic device according to the 14thembodiment of the present disclosure; and

FIG. 24 shows a schematic view of Yc321, Yc322, Yc511, Yc512, Yc62, Yc72and Yc82, as well as several inflection points and critical points ofthe eight lens elements according to the 1st embodiment of the presentdisclosure.

DETAILED DESCRIPTION

A photographing lens assembly includes eight lens elements. By utilizingas many as eight lens elements, it is favorable for providing betterimaging capability along with an image sensor having improved featuresin aspects such as pixel size, resolution or chief ray angles. It isalso favorable for providing proper design flexibility of the lenselements so as to meet requirements such as controlling the size of thelens assembly. The eight lens elements are, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element, a sixth lenselement, a seventh lens element and an eighth lens element.

The first lens element has positive refractive power. Therefore, it isfavorable for providing the positive refractive power required forachieving compactness. The first lens element has an object-side surfacebeing convex in a paraxial region thereof. Therefore, it is favorablefor balancing the incident light at each field of view in thephotographing lens assembly.

The sixth lens element has an image-side surface being concave in aparaxial region thereof. Therefore, it is favorable for meeting thespecifications such as compactness and a short total track length of thephotographing lens assembly.

The seventh lens element can have positive refractive power. Therefore,it is favorable for providing light converging capability at the imageside of the photographing lens assembly. The seventh lens element canhave an object-side surface being convex in a paraxial region thereof.Therefore, it is favorable for correcting off-axis field curvature. Theseventh lens element has an image-side surface being concave in aparaxial region thereof. Therefore, it is favorable for further meetingthe specifications such as compactness and a short total track length ofthe photographing lens assembly.

The eighth lens element has negative refractive power. Therefore, it isfavorable for balancing aberrations from the miniaturization of thephotographing lens assembly. The eighth lens element has an image-sidesurface being concave in a paraxial region thereof. Therefore, it isfavorable for positioning the principal point away from an imagesurface, and further reducing the total track length of thephotographing lens assembly.

The image-side surface of the eighth lens element has at least onecritical point in an off-axis region thereof. Therefore, it is favorablefor improving image quality in the peripheral region of the imagesurface. Moreover, the image-side surface of the sixth lens element canhave at least one critical point in an off-axis region thereof.Moreover, the image-side surface of the seventh lens element can have atleast one critical point in an off-axis thereof. Moreover, each ofobject-side surfaces and image-side surfaces of the sixth through eighthlens elements can have at least one critical point in an off-axis regionthereof. Moreover, at least one lens surface of at least one lenselement can have at least two critical points in an off-axis regionthereof. When a vertical distance between the critical point closest toan optical axis of the at least two critical points and the optical axisis Yc1, and a vertical distance between the critical point closest to amaximum effective radius position of the at least two critical pointsand the optical axis is Yc2, the following condition can be satisfied:1.20<|Yc2/Yc1|<5.0. For example, in the 1st embodiment of the presentdisclosure, when a vertical distance between a critical point closest tothe optical axis on the image-side surface of the third lens element andthe optical axis is Yc321, and a vertical distance between a criticalpoint closest to a maximum effective radius position on the image-sidesurface of the third lens element and the optical axis is Yc322, thefollowing condition can be satisfied: 1.20<|Yc322/Yc321|<5.0. When avertical distance between a critical point closest to the optical axison the object-side surface of the fifth lens element and the opticalaxis is Yc511, and a vertical distance between a critical point closestto a maximum effective radius position on the object-side surface of thefifth lens element and the optical axis is Yc512, the followingcondition can be satisfied: 1.20<|Yc512/Yc511|<5.0. Please refer to FIG.24, which shows a schematic view of Yc321, Yc322, Yc511, Yc512 andseveral critical points C of the eight lens elements according to the1st embodiment of the present disclosure. The critical points on theimage-side surface of the third lens element, the object-side surface ofthe fifth lens element, the object-side surface of the sixth lenselement, the image-side surface of the sixth lens element, theobject-side surface of the seventh lens element, the image-side surfaceof the seventh lens element, the object-side surface of the eighth lenselement and the image-side surface of the eighth lens element in FIG. 24are only exemplary. The other lens surfaces of the eight lens elementsmay also have one or more critical points.

At least one lens surface of the third through seventh lens elements canhave at least one inflection point. Therefore, it is favorable forimproving image quality in the peripheral region of the image surface.Please refer to FIG. 24, which shows a schematic view of severalinflection points P of the eight lens elements according to the 1stembodiment of the present disclosure. The inflection points on theobject-side surface of the third lens element, the image-side surface ofthe third lens element, the object-side surface of the fourth lenselement, the image-side surface of the fourth lens element, theobject-side surface of the fifth lens element, the image-side surface ofthe fifth lens element, the object-side surface of the sixth lenselement, the image-side surface of the sixth lens element, theobject-side surface of the seventh lens element and the image-sidesurface of the seventh lens element in FIG. 24 are only exemplary. Theother lens surfaces of the eight lens elements may also have one or moreinflection points.

When a central thickness of the first lens element is CT1, and a maximumvalue among central thicknesses of the second through eighth lenselements is MaxCT28, the following condition is satisfied:1.0<CT1/MaxCT28. Therefore, it is favorable for preventing the firstlens element from being overly thick so as to improve space utilizationfor the other lens elements. Moreover, the following condition can alsobe satisfied: 1.5<CT1/MaxCT28<3.5.

When a curvature radius of the image-side surface of the seventh lenselement is R14, and a curvature radius of the object-side surface of theeighth lens element is R15, the following condition is satisfied:R14/R15<1.20. Therefore, it is favorable for reducing the back focallength so as to properly utilize the limited space of the photographinglens assembly. Moreover, the following condition can also be satisfied:−2.5<R14/R15<0.50.

When an axial distance between the object-side surface of the third lenselement and the image-side surface of the fifth lens element is Dr5r10,and an axial distance between the object-side surface of the sixth lenselement and the image-side surface of the eighth lens element isDr11r16, the following condition is satisfied: Dr5r10/Dr11r16<1.0.Therefore, it is favorable for preventing axial distances between eachof all adjacent lens elements from being excessive large or small so asto improve space utilization for the lens elements. Moreover, thefollowing condition can also be satisfied: Dr5r10/Dr11r16<0.90.Moreover, the following condition can also be satisfied:0.30<Dr5r10/Dr11r16<0.75.

When an axial distance between the seventh lens element and the eighthlens element is T78, a central thickness of the seventh lens element isCT7, and a central thickness of the eighth lens element is CT8, thefollowing condition can be satisfied: 0.40<T78/(CT7+CT8)<1.5. Therefore,it is favorable for ensuring sufficient space between the seventh lenselement and the eighth lens element so as to meet the requirements ofthe size and image quality of the photographing lens assembly. Moreover,the following condition can also be satisfied: 0.60<T78/(CT7+CT8)<1.25.

When an axial distance between the first lens element and the secondlens element is T12, an axial distance between the second lens elementand the third lens element is T23, an axial distance between the thirdlens element and the fourth lens element is T34, an axial distancebetween the fourth lens element and the fifth lens element is T45, anaxial distance between the fifth lens element and the sixth lens elementis T56, an axial distance between the sixth lens element and the seventhlens element is T67, the axial distance between the seventh lens elementand the eighth lens element is T78, and an axial distance between theimage-side surface of the eighth lens element and the image surface isBL, the following conditions can be satisfied: 1.0<T78/T12; 1.0<T78/T23;1.0<T78/T34; 1.0<T78/T45; 1.0<T78/T56; 1.10<T78/T67; and 0.80<T78/BL.Therefore, it is favorable for providing larger space between theseventh lens element and the eighth lens element so as to better correctaberrations on the image side of the photographing lens assembly.

When an Abbe number of the third lens element is V3, and an Abbe numberof the sixth lens element is V6, the following condition can besatisfied: −1.0<(V3−V6)/(V3+V6)<−0.30. Therefore, it is favorable forbetter correcting chromatic aberration.

When a vertical distance between the critical point on the image-sidesurface of the sixth lens element and the optical axis is Yc62, avertical distance between the critical point on the image-side surfaceof the seventh lens element and the optical axis is Yc72, and a verticaldistance between the critical point on the image-side surface of theeighth lens element and the optical axis is Yc82, the followingcondition can be satisfied: Yc62<Yc82<Yc72. Therefore, it is favorablefor improving image quality in the peripheral region of the imagesurface. Please refer to FIG. 24, which shows a schematic view of Yc62,Yc72 and Yc82 according to the 1st embodiment of the present disclosure.

When an entrance pupil diameter of the photographing lens assembly isEPD, and the axial distance between the object-side surface of the thirdlens element and the image-side surface of the fifth lens element isDr5r10, the following condition can be satisfied: 2.0<EPD/Dr5r10<4.0.Therefore, it is favorable for providing the configuration of thephotographing lens assembly featuring a large aperture.

When a focal length of the photographing lens assembly is f, a curvatureradius of the image-side surface of the sixth lens element is R12, thecurvature radius of the image-side surface of the seventh lens elementis R14, and a curvature radius of the image-side surface of the eighthlens element is R16, the following condition can be satisfied:3.0<f/R12+f/R14+f/R16<10. Therefore, it is favorable for reducing thetotal track length of the photographing lens assembly. Moreover, thefollowing condition can also be satisfied: 3.5<f/R12+f/R14+f/R16<7.5.

When an f-number of the photographing lens assembly is Fno, and half ofa maximum field of view of the photographing lens assembly is HFOV, thefollowing condition can be satisfied: Fno/tan(HFOV)<2.20. Therefore, itis favorable for featuring the large aperture in the photographing lensassembly.

When a sum of axial distances between each of all adjacent lens elementsof the photographing lens assembly is ΣAT, the axial distance betweenthe second lens element and the third lens element is T23, the axialdistance between the fifth lens element and the sixth lens element isT56, and the axial distance between the seventh lens element and theeighth lens element is T78, the following condition can be satisfied:1.0<ΣAT/(T23+T56+T78)<1.50. Therefore, it is favorable for preventingaxial distances between each of all adjacent lens elements from beingexcessive large or small so as to improve space utilization for the lenselements.

When a composite focal length of the first lens element and the secondlens element is f12, and a composite focal length of the third lenselement, the fourth lens element and the fifth lens element is f345, thefollowing condition can be satisfied: 0<f12/f345<1.50. Therefore, it isfavorable for having proper positive refractive power on the object sideto so as to reduce the total track length of the photographing lensassembly.

When the focal length of the photographing lens assembly is f, and acomposite focal length of the sixth lens element, the seventh lenselement and the eighth lens element is f678, the following condition canbe satisfied: f/f678<−0.20. Therefore, a proper configuration of thesixth lens element, the seventh lens element and the eighth lens elementis favorable for correcting aberrations in the peripheral region andreducing the back focal length of the photographing lens assembly.

When the focal length of the photographing lens assembly is f, a focallength of the first lens element is f1, a focal length of the secondlens element is f2, a focal length of the third lens element is f3, afocal length of the fourth lens element is f4, a focal length of thefifth lens element is f5, a focal length of the sixth lens element isf6, a focal length of the seventh lens element is f7, a focal length ofthe eighth lens element is f8, and a focal length of the i-th lenselement is fi, at least one lens element of the photographing lensassembly can satisfy the following condition: |f/fi|<0.10, wherein i=1,2, 3, 4, 5, 6, 7 or 8. Therefore, it is favorable for preventing overlylarge differences in refractive power among lens elements and avoidingimage overcorrection so as to provide a proper surface shape for thelens elements for reducing the probability of ghosting.

When the focal length of the seventh lens element is f7, and the focallength of the eighth lens element is f8, the following condition can besatisfied: f7/f8<−0.50. Therefore, it is favorable for balancing therefractive power of the image side of the photographing lens assembly soas to control the size of an image capturing unit.

When the focal length of the first lens element is f1, the focal lengthof the second lens element is f2, the focal length of the third lenselement is f3, the focal length of the fourth lens element is f4, thefocal length of the fifth lens element is f5, the focal length of thesixth lens element is f6, the focal length of the seventh lens elementis f7, and the focal length of the eighth lens element is f8, thefollowing conditions can be satisfied: |f8/f1|<1.0; |f8/f2|<1.0;|f8/f3|<1.0; |f8/f4|<1.0; |f8/f5|<1.0; |f8/f6|<1.0; and |f8/f7|<1.0.Therefore, it is favorable for the eighth lens element to have properrefractive power so as to reduce the size of the image capturing unit.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, the Abbe number of the third lens elementis V3, an Abbe number of the fourth lens element is V4, an Abbe numberof the fifth lens element is V5, the Abbe number of the sixth lenselement is V6, an Abbe number of the seventh lens element is V7, an Abbenumber of the eighth lens element is V8, an Abbe number of the i-th lenselement is Vi, a refractive index of the first lens element is N1, arefractive index of the second lens element is N2, a refractive index ofthe third lens element is N3, a refractive index of the fourth lenselement is N4, a refractive index of the fifth lens element is N5, arefractive index of the sixth lens element is N6, a refractive index ofthe seventh lens element is N7, a refractive index of the eighth lenselement is N8, and a refractive index of the i-th lens element is Ni, atleast two lens elements of the photographing lens assembly can satisfythe following condition: 5.0<Vi/Ni<12.0, wherein i=1, 2, 3, 4, 5, 6, 7or 8. Therefore, it is favorable for better correcting chromaticaberration. Moreover, at least two lens elements of the photographinglens assembly can also satisfy the following condition: 6.0<Vi/Ni<11.0,wherein i=1, 2, 3, 4, 5, 6, 7 or 8.

When an axial distance between the object-side surface of the first lenselement and the image surface is TL, and a maximum image height of thephotographing lens assembly (half of a diagonal length of an effectivephotosensitive area of an image sensor) is ImgH, the following conditioncan be satisfied: TL/ImgH<1.60. Therefore, it is favorable for balancingbetween lens miniaturization and manufacturability.

When the maximum image height of the photographing lens assembly isImgH, and the axial distance between the image-side surface of theeighth lens element and the image surface is BL, the following conditioncan be satisfied: 5.0<ImgH/BL. Therefore, it is favorable for furtherreducing the back focal length of the photographing lens assembly so asto utilize limited space properly. Moreover, the following condition canalso be satisfied: 6.0<ImgH/BL.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the present disclosure, the lens elements of thephotographing lens assembly can be made of either glass or plasticmaterial. When the lens elements are made of glass material, therefractive power distribution of the photographing lens assembly may bemore flexible. The glass lens element can either be made by grinding ormolding. When the lens elements are made of plastic material, themanufacturing costs can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be aspheric, which allows morecontrol variables for eliminating aberrations thereof, the requirednumber of the lens elements can be reduced, and the total track lengthof the photographing lens assembly can be effectively shortened. Theaspheric surfaces may be formed by plastic injection molding or glassmolding.

According to the present disclosure, when a lens surface is aspheric, itmeans that the lens surface has an aspheric shape throughout itsoptically effective area, or a portion(s) thereof.

According to the present disclosure, one or more of the lens elements'material may optionally include an additive which alters the lenselements' transmittance in a specific range of wavelength for areduction in unwanted stray light or color deviation. For example, theadditive may optionally filter out light in the wavelength range of 600nm to 800 nm to reduce excessive red light and/or near infrared light;or may optionally filter out light in the wavelength range of 350 nm to450 nm to reduce excessive blue light and/or near ultraviolet light frominterfering the final image. The additive may be homogeneously mixedwith a plastic material to be used in manufacturing a mixed-materiallens element by injection molding.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly,unless otherwise stated, when the lens element has a convex surface, itindicates that the surface is convex in the paraxial region thereof;when the lens element has a concave surface, it indicates that thesurface is concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement is in the paraxial region thereof.

According to the present disclosure, an inflection point is a point onthe surface of the lens element at which the surface changes fromconcave to convex, or vice versa. A critical point is a non-axial pointof the lens surface where its tangent is perpendicular to the opticalaxis.

According to the present disclosure, the image surface of thephotographing lens assembly, based on the corresponding image sensor,can be flat or curved, especially a curved surface being concave facingtowards the object side of the photographing lens assembly.

According to the present disclosure, an image correction unit, such as afield flattener, can be optionally disposed between the lens elementclosest to the image side of the photographing lens assembly and theimage surface for correction of aberrations such as field curvature. Theoptical properties of the image correction unit, such as curvature,thickness, index of refraction, position and surface shape (convex orconcave surface with spherical, aspheric, diffractive or Fresnel types),can be adjusted according to the design of the image capturing unit. Ingeneral, a preferable image correction unit is, for example, a thintransparent element having a concave object-side surface and a planarimage-side surface, and the thin transparent element is disposed nearthe image surface.

According to the present disclosure, the photographing lens assembly caninclude at least one stop, such as an aperture stop, a glare stop or afield stop. Said glare stop or said field stop is set for eliminatingthe stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between animaged object and the first lens element can provide a longer distancebetween an exit pupil of the photographing lens assembly and the imagesurface to produce a telecentric effect, and thereby improves theimage-sensing efficiency of an image sensor (for example, CCD or CMOS).A middle stop disposed between the first lens element and the imagesurface is favorable for enlarging the viewing angle of thephotographing lens assembly and thereby provides a wider field of viewfor the same.

According to the present disclosure, the photographing lens assembly caninclude an aperture control unit. The aperture control unit may be amechanical component or a light modulator, which can control the sizeand shape of the aperture through electricity or electrical signals. Themechanical component can include a movable member, such as a bladeassembly or a light baffle. The light modulator can include a shieldingelement, such as a filter, an electrochromic material or aliquid-crystal layer. The aperture control unit controls the amount ofincident light or exposure time to enhance the capability of imagequality adjustment. In addition, the aperture control unit can be theaperture stop of the present disclosure, which changes the f-number toobtain different image effects, such as the depth of field or lensspeed.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 199. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 100, a first lens element 110, a second lens element 120,a stop 101, a third lens element 130, a stop 102, a fourth lens element140, a fifth lens element 150, a sixth lens element 160, a seventh lenselement 170, a stop 103, an eighth lens element 180, an IR-cut filter190 and an image surface 195. The photographing lens assembly includeseight lens elements (110, 120, 130, 140, 150, 160, 170 and 180) with noadditional lens element disposed between each of the adjacent eight lenselements.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric. The object-side surface 111 of the first lens element 110 hasone inflection point. The image-side surface 112 of the first lenselement 110 has one inflection point.

The second lens element 120 with negative refractive power has anobject-side surface 121 being convex in a paraxial region thereof and animage-side surface 122 being concave in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being concave in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric. The object-side surface 131 of the third lens element 130 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 132 of the third lens element 130 hastwo inflection points and two critical points in an off-axis regionthereof.

The fourth lens element 140 with positive refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric. The object-side surface 141 of the fourth lens element 140 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 142 of the fourth lens element 140 hasone inflection point.

The fifth lens element 150 with negative refractive power has anobject-side surface 151 being concave in a paraxial region thereof andan image-side surface 152 being convex in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric. The object-side surface 151 of the fifth lens element 150 hasfour inflection points and two critical points in an off-axis regionthereof. The image-side surface 152 of the fifth lens element 150 hastwo inflection points.

The sixth lens element 160 with negative refractive power has anobject-side surface 161 being convex in a paraxial region thereof and animage-side surface 162 being concave in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric. The object-side surface 161 of the sixth lens element 160 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 162 of the sixth lens element 160 hasthree inflection points and one critical point in an off-axis regionthereof.

The seventh lens element 170 with positive refractive power has anobject-side surface 171 being convex in a paraxial region thereof and animage-side surface 172 being concave in a paraxial region thereof. Theseventh lens element 170 is made of plastic material and has theobject-side surface 171 and the image-side surface 172 being bothaspheric. The object-side surface 171 of the seventh lens element 170has two inflection points and one critical point in an off-axis regionthereof. The image-side surface 172 of the seventh lens element 170 hastwo inflection points and one critical point in an off-axis regionthereof.

The eighth lens element 180 with negative refractive power has anobject-side surface 181 being concave in a paraxial region thereof andan image-side surface 182 being concave in a paraxial region thereof.The eighth lens element 180 is made of plastic material and has theobject-side surface 181 and the image-side surface 182 being bothaspheric. The object-side surface 181 of the eighth lens element 180 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 182 of the eighth lens element 180 hasthree inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 190 is made of glass material and located between theeighth lens element 180 and the image surface 195, and will not affectthe focal length of the photographing lens assembly. The image sensor199 is disposed on or near the image surface 195 of the photographinglens assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {sqr{t\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14, 16, 18 and 20.

In the photographing lens assembly of the image capturing unit accordingto the 1st embodiment, when a focal length of the photographing lensassembly is f, an f-number of the photographing lens assembly is Fno,and half of a maximum field of view of the photographing lens assemblyis HFOV, these parameters have the following values: f=6.68 millimeters(mm), Fno=1.53, HFOV=39.8 degrees (deg.).

When the f-number of the photographing lens assembly is Fno, and half ofthe maximum field of view of the photographing lens assembly is HFOV,the following condition is satisfied: Fno/tan(HFOV)=1.83.

When an Abbe number of the first lens element 110 is V1, and arefractive index of the first lens element 110 is N1, the followingcondition is satisfied: V1/N1=36.27.

When an Abbe number of the second lens element 120 is V2, and arefractive index of the second lens element 120 is N2, the followingcondition is satisfied: V2/N2=11.34.

When an Abbe number of the third lens element 130 is V3, and arefractive index of the third lens element 130 is N3, the followingcondition is satisfied: V3/N3=10.91.

When an Abbe number of the fourth lens element 140 is V4, and arefractive index of the fourth lens element 140 is N4, the followingcondition is satisfied: V4/N4=36.23.

When an Abbe number of the fifth lens element 150 is V5, and arefractive index of the fifth lens element 150 is N5, the followingcondition is satisfied: V5/N5=36.23.

When an Abbe number of the sixth lens element 160 is V6, and arefractive index of the sixth lens element 160 is N6, the followingcondition is satisfied: V6/N6=28.33.

When an Abbe number of the seventh lens element 170 is V7, and arefractive index of the seventh lens element 170 is N7, the followingcondition is satisfied: V7/N7=36.23.

When an Abbe number of the eighth lens element 180 is V8, and arefractive index of the eighth lens element 180 is N8, the followingcondition is satisfied: V8/N8=36.23.

When the Abbe number of the third lens element 130 is V3, and the Abbenumber of the sixth lens element 160 is V6, the following condition issatisfied: (V3−V6)/(V3+V6)=−0.41.

When a central thickness of the first lens element 110 is CT1, and amaximum value among central thicknesses of the second through eighthlens elements 180 is MaxCT28, the following condition is satisfied:CT1/MaxCT28=2.36. In this embodiment, among the second lens element 120,the third lens element 130, the fourth lens element 140, the fifth lenselement 150, the sixth lens element 160, the seventh lens element 170and the eighth lens element 180, a central thickness of the fourth lenselement 140 is larger than the central thicknesses of the other lenselements, and MaxCT28 is equal to the central thickness of the fourthlens element 140.

When an axial distance between the first lens element 110 and the secondlens element 120 is T12, and an axial distance between the seventh lenselement 170 and the eighth lens element 180 is T78, the followingcondition is satisfied: T78/T12=23.93. In this embodiment, an axialdistance between two adjacent lens elements is an air gap in a paraxialregion between the two adjacent lens elements.

When an axial distance between the second lens element 120 and the thirdlens element 130 is T23, and the axial distance between the seventh lenselement 170 and the eighth lens element 180 is T78, the followingcondition is satisfied: T78/T23=2.27.

When an axial distance between the third lens element 130 and the fourthlens element 140 is T34, and the axial distance between the seventh lenselement 170 and the eighth lens element 180 is T78, the followingcondition is satisfied: T78/T34=4.39.

When an axial distance between the fourth lens element 140 and the fifthlens element 150 is T45, and the axial distance between the seventh lenselement 170 and the eighth lens element 180 is T78, the followingcondition is satisfied: T78/T45=7.80.

When an axial distance between the fifth lens element 150 and the sixthlens element 160 is T56, and the axial distance between the seventh lenselement 170 and the eighth lens element 180 is T78, the followingcondition is satisfied: T78/T56=2.00.

When an axial distance between the sixth lens element 160 and theseventh lens element 170 is T67, and the axial distance between theseventh lens element 170 and the eighth lens element 180 is T78, thefollowing condition is satisfied: T78/T67=12.10.

When the axial distance between the seventh lens element 170 and theeighth lens element 180 is T78, a central thickness of the seventh lenselement 170 is CT7, and a central thickness of the eighth lens element180 is CT8, the following condition is satisfied: T78/(CT7+CT8)=0.96.

When the axial distance between the seventh lens element 170 and theeighth lens element 180 is T78, and an axial distance between theimage-side surface 182 of the eighth lens element 180 and the imagesurface 195 is BL, the following condition is satisfied: T78/BL=1.11.

When a sum of axial distances between each of all adjacent lens elementsof the photographing lens assembly is ΣAT, the axial distance betweenthe second lens element 120 and the third lens element 130 is T23, theaxial distance between the fifth lens element 150 and the sixth lenselement 160 is T56, and the axial distance between the seventh lenselement 170 and the eighth lens element 180 is T78, the followingcondition is satisfied: ΣAT/(T23+T56+T78)=1.25. In this embodiment, ΣATis the sum of the axial distances between the first lens element 110 andthe second lens element 120, the second lens element 120 and the thirdlens element 130, the third lens element 130 and the fourth lens element140, the fourth lens element 140 and the fifth lens element 150, thefifth lens element 150 and the sixth lens element 160, the sixth lenselement 160 and the seventh lens element 170, and the seventh lenselement 170 and the eighth lens element 180.

When an axial distance between the object-side surface 131 of the thirdlens element 130 and the image-side surface 152 of the fifth lenselement 150 is Dr5r10, and an axial distance between the object-sidesurface 161 of the sixth lens element 160 and the image-side surface 182of the eighth lens element 180 is Dr11r16, the following condition issatisfied: Dr5r10/Dr11r16=0.63.

When an entrance pupil diameter of the photographing lens assembly isEPD, and the axial distance between the object-side surface 131 of thethird lens element 130 and the image-side surface 152 of the fifth lenselement 150 is Dr5r10, the following condition is satisfied:EPD/Dr5r10=2.54.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 195 is TL, and a maximum imageheight of the photographing lens assembly is ImgH, the followingcondition is satisfied: TL/ImgH=1.42.

When the maximum image height of the photographing lens assembly isImgH, and the axial distance between the image-side surface 182 of theeighth lens element 180 and the image surface 195 is BL, the followingcondition is satisfied: ImgH/BL=6.03.

When a vertical distance between the critical point on the image-sidesurface 162 of the sixth lens element 160 and the optical axis is Yc62,the following condition is satisfied: Yc62=1.06 [mm].

When a vertical distance between the critical point on the image-sidesurface 172 of the seventh lens element 170 and the optical axis isYc72, the following condition is satisfied: Yc72=1.74 [mm].

When a vertical distance between the critical point on the image-sidesurface 182 of the eighth lens element 180 and the optical axis is Yc82,the following condition is satisfied: Yc82=1.21 [mm].

When a curvature radius of the image-side surface 172 of the seventhlens element 170 is R14, and a curvature radius of an object-sidesurface 181 of the eighth lens element 180 is R15, the followingcondition is satisfied: R14/R15=−0.94.

When the focal length of the photographing lens assembly is f, acurvature radius of the image-side surface 162 of the sixth lens element160 is R12, the curvature radius of the image-side surface 172 of theseventh lens element 170 is R14, a curvature radius of the image-sidesurface 182 of the eighth lens element 180 is R16, the followingcondition is satisfied: f/R12+f/R14+f/R16=3.59.

When a focal length of the seventh lens element 170 is f7, and a focallength of the eighth lens element 180 is f8, the following condition issatisfied: f7/f8=−1.06.

When a focal length of the first lens element 110 is f1, and the focallength of the eighth lens element 180 is f8, the following condition issatisfied: |f8/f1I=0.88.

When a focal length of the second lens element 120 is f2, and the focallength of the eighth lens element 180 is f8, the following condition issatisfied: |f8/f2|=0.39.

When a focal length of the third lens element 130 is f3, and the focallength of the eighth lens element 180 is f8, the following condition issatisfied: |f8/f3|=0.02.

When a focal length of the fourth lens element 140 is f4, and the focallength of the eighth lens element 180 is f8, the following condition issatisfied: |f8/f4|=0.27.

When a focal length of the fifth lens element 150 is f5, and the focallength of the eighth lens element 180 is f8, the following condition issatisfied: |f8/f5|=0.04.

When a focal length of the sixth lens element 160 is f6, and the focallength of the eighth lens element 180 is f8, the following condition issatisfied: |f8/f6|=0.50.

When the focal length of the seventh lens element 170 is f7, and thefocal length of the eighth lens element 180 is f8, the followingcondition is satisfied: |f8/f7|=0.95.

When the focal length of the photographing lens assembly is f, and thefocal length of the first lens element 110 is f1, the followingcondition is satisfied: |f/f1I=1.09.

When the focal length of the photographing lens assembly is f, and thefocal length of the second lens element 120 is f2, the followingcondition is satisfied: |f/f2|=0.48.

When the focal length of the photographing lens assembly is f, and thefocal length of the third lens element 130 is f3, the followingcondition is satisfied: |f/f3|=0.03.

When the focal length of the photographing lens assembly is f, and thefocal length of the fourth lens element 140 is f4, the followingcondition is satisfied: |f/f4|=0.33.

When the focal length of the photographing lens assembly is f, and thefocal length of the fifth lens element 150 is f5, the followingcondition is satisfied: |f/f5|=0.05.

When the focal length of the photographing lens assembly is f, and thefocal length of the sixth lens element 160 is f6, the followingcondition is satisfied: |f/f6|=0.62.

When the focal length of the photographing lens assembly is f, and thefocal length of the seventh lens element 170 is f7, the followingcondition is satisfied: |f/f7|=1.17.

When the focal length of the photographing lens assembly is f, and thefocal length of the eighth lens element 180 is f8, the followingcondition is satisfied: |f/f8|=1.23.

When a composite focal length of the first lens element 110 and thesecond lens element 120 is f12, and a composite focal length of thethird lens element 130, the fourth lens element 140 and the fifth lenselement 150 is f345, the following condition is satisfied:f12/f345=0.41.

When the focal length of the photographing lens assembly is f, and acomposite focal length of the sixth lens element 160, the seventh lenselement 170 and the eighth lens element 180 is f678, the followingcondition is satisfied: f/f678=−0.51.

When a vertical distance between the critical point closest to theoptical axis on the image-side surface 132 of the third lens element 130and the optical axis is Yc321, and a vertical distance between thecritical point closest to a maximum effective radius position on theimage-side surface 132 of the third lens element 130 and the opticalaxis is Yc322, the following condition is satisfied: |Yc322/Yc321|=1.31.

When a vertical distance between the critical point closest to theoptical axis on the object-side surface 151 of the fifth lens element150 and the optical axis is Yc511, and a vertical distance between thecritical point closest to a maximum effective radius position on theobject-side surface 151 of the fifth lens element 150 and the opticalaxis is Yc512, the following condition is satisfied: |Yc512/Yc511|=1.47.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 6.68 mm, Fno = 1.53, HFOV = 39.8 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.972 2 Lens 1 2.857 (ASP) 1.358Plastic 1.545 56.0 6.15 3 16.180 (ASP) 0.044 4 Lens 2 12.935 (ASP) 0.320Plastic 1.676 19.0 −14.02 5 5.415 (ASP) 0.410 6 Stop Plano 0.054 7 Lens3 6.015 (ASP) 0.350 Plastic 1.686 18.4 225.32 8 6.111 (ASP) 0.158 9 StopPlano 0.082 10 Lens 4 −73.239 (ASP) 0.576 Plastic 1.544 55.9 20.44 11−9.676 (ASP) 0.135 12 Lens 5 −18.022 (ASP) 0.418 Plastic 1.544 55.9−125.33 13 −24.703 (ASP) 0.526 14 Lens 6 36.414 (ASP) 0.474 Plastic1.560 44.2 −10.84 15 5.178 (ASP) 0.087 16 Lens 7 2.120 (ASP) 0.559Plastic 1.544 55.9 5.73 17 6.034 (ASP) −0.867 18 Stop Plano 1.920 19Lens 8 −6.413 (ASP) 0.542 Plastic 1.544 55.9 −5.42 20 5.610 (ASP) 0.45021 IR-cut Filter Plano 0.210 Glass 1.517 64.2 — 22 Plano 0.285 23 ImagePlano 0.000 Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 101 (Surface 6) is 1.800 mm. An effectiveradius of the stop 102 (Surface 9) is 1.980 mm. An effective radius ofthe stop 103 (Surface 18) is 3.700 mm.

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 7 k =  7.0804E−03−2.3366E+01  9.1085E+00 −1.7123E−01  5.6658E+00 A4 = −1.8828E−03−1.6584E−02 −1.9460E−02 −7.1983E−03 −2.4146E−02 A6 =  2.3955E−03 1.4743E−02  1.4960E−02  6.8045E−03 −8.1392E−03 A8 = −1.5829E−03−6.2555E−03 −5.1034E−03 −4.2131E−03  6.8059E−03 A10 =  6.3492E−04 1.3930E−03  8.1859E−04  2.2954E−03 −4.7232E−03 A12 = −1.5538E−04−1.4940E−04 −1.7731E−05 −7.0593E−04  1.4466E−03 A14 =  2.1916E−05 5.1911E−06 −3.6368E−06  9.5363E−05 −1.4845E−04 A16 = −1.4638E−06 — — —— Surface # 8 10 11 12 13 k =  5.5951E+00 0.0000E+00 3.6026E−013.0793E+01 5.0575E+01 A4 = −1.1880E−02 1.6692E−02 6.5801E−02 8.9064E−023.4936E−02 A6 = −2.0365E−02 −3.7954E−02  −9.8487E−02  −1.1563E−01 −4.0622E−02  A8 =  1.8889E−02 3.8152E−02 7.0499E−02 6.9774E−021.4252E−02 A10 = −1.0800E−02 −2.0626E−02  −2.8884E−02  −2.3940E−02 −8.9772E−04  A12 =  3.0147E−03 5.8390E−03 6.6963E−03 4.3469E−03−1.0389E−03  A14 = −3.2572E−04 −8.0538E−04  −8.1899E−04  −3.5127E−04 3.4290E−04 A16 =  5.5921E−06 4.2796E−05 4.1501E−05 6.9412E−06−4.1572E−05  A18 = — — — — 1.7845E−06 Surface # 14 15 16 17 19 k =0.0000E+00 −3.1755E+01 −1.0000E+00 0.0000E+00  0.0000E+00 A4 =3.1776E−02 −3.9640E−02 −6.7105E−02 2.8365E−02 −4.7231E−02 A6 =−3.0134E−02   1.0315E−02  2.0331E−02 −1.9991E−02   1.0987E−02 A8 =1.3807E−02 −3.0035E−03 −1.0274E−02 3.2189E−03 −1.6780E−03 A10 =−4.6698E−03   6.0133E−04  2.8122E−03 3.0935E−05  2.2118E−04 A12 =1.0074E−03 −1.2688E−04 −4.3062E−04 −9.4739E−05  −2.1749E−05 A14 =−1.3573E−04   2.5559E−05  3.9118E−05 1.6151E−05  1.4118E−06 A16 =1.0322E−05 −3.0513E−06 −2.1041E−06 −1.3112E−06  −5.6333E−08 A18 =−3.2692E−07   1.7809E−07  6.2865E−08 5.3683E−08  1.2492E−09 A20 = —−3.9553E−09 −8.3078E−10 −8.8687E−10  −1.1779E−11 Surface # 20 k =−6.7889E−01 A4 = −4.7218E−02 A6 =  1.0481E−02 A8 = −1.9075E−03 A10 = 2.3983E−04 A12 = −1.8914E−05 A14 =  8.8448E−07 A16 = −2.2649E−08 A18 = 2.6144E−10 A20 = −6.0119E−13

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-23 represent the surfacessequentially arranged from the object side to the image side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-20 represent the asphericcoefficients ranging from the 4th order to the 20th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 299. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 200, a first lens element 210, a second lens element 220,a stop 201, a third lens element 230, a stop 202, a fourth lens element240, a fifth lens element 250, a sixth lens element 260, a seventh lenselement 270, an eighth lens element 280, an IR-cut filter 290 and animage surface 295. The photographing lens assembly includes eight lenselements (210, 220, 230, 240, 250, 260, 270 and 280) with no additionallens element disposed between each of the adjacent eight lens elements.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric. The image-side surface 212 of the first lens element 210 hasone inflection point.

The second lens element 220 with negative refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with negative refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being concave in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric. The object-side surface 231 of the third lens element 230 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 232 of the third lens element 230 hastwo inflection points and two critical points in an off-axis regionthereof.

The fourth lens element 240 with positive refractive power has anobject-side surface 241 being convex in a paraxial region thereof and animage-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric. The object-side surface 241 of the fourth lens element 240 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 242 of the fourth lens element 240 hasone inflection point.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being planar in a paraxial region thereof and animage-side surface 252 being convex in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric. The object-side surface 251 of the fifth lens element 250 hasthree inflection points and one critical point in an off-axis regionthereof. The image-side surface 252 of the fifth lens element 250 hasfourth inflection points and two critical points in an off-axis regionthereof.

The sixth lens element 260 with negative refractive power has anobject-side surface 261 being concave in a paraxial region thereof andan image-side surface 262 being concave in a paraxial region thereof.The sixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric. The object-side surface 261 of the sixth lens element 260 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 262 of the sixth lens element 260 hastwo inflection points and one critical point in an off-axis regionthereof.

The seventh lens element 270 with positive refractive power has anobject-side surface 271 being convex in a paraxial region thereof and animage-side surface 272 being concave in a paraxial region thereof. Theseventh lens element 270 is made of plastic material and has theobject-side surface 271 and the image-side surface 272 being bothaspheric. The object-side surface 271 of the seventh lens element 270has two inflection points and one critical point in an off-axis regionthereof. The image-side surface 272 of the seventh lens element 270 hastwo inflection points and one critical point in an off-axis regionthereof.

The eighth lens element 280 with negative refractive power has anobject-side surface 281 being concave in a paraxial region thereof andan image-side surface 282 being concave in a paraxial region thereof.The eighth lens element 280 is made of plastic material and has theobject-side surface 281 and the image-side surface 282 being bothaspheric. The object-side surface 281 of the eighth lens element 280 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 282 of the eighth lens element 280 hasthree inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 290 is made of glass material and located between theeighth lens element 280 and the image surface 295, and will not affectthe focal length of the photographing lens assembly. The image sensor299 is disposed on or near the image surface 295 of the photographinglens assembly.

When a vertical distance between the critical point closest to theoptical axis on the object-side surface 241 of the fourth lens element240 and the optical axis is Yc411, and a vertical distance between thecritical point closest to a maximum effective radius position on theobject-side surface 241 of the fourth lens element 240 and the opticalaxis is Yc412, the following condition is satisfied: |Yc412/Yc411|=1.64.

When a vertical distance between the critical point closest to theoptical axis on the image-side surface 252 of the fifth lens element 250and the optical axis is Yc521, and a vertical distance between thecritical point closest to a maximum effective radius position on theimage-side surface 252 of the fifth lens element 250 and the opticalaxis is Yc522, the following condition is satisfied: |Yc522/Yc521|=3.47.

When a vertical distance between the critical point closest to theoptical axis on the object-side surface 261 of the sixth lens element260 and the optical axis is Yc611, and a vertical distance between thecritical point closest to a maximum effective radius position on theobject-side surface 261 of the sixth lens element 260 and the opticalaxis is Yc612, the following condition is satisfied: |Yc612/Yc611|=4.13.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 6.66 mm, Fno = 1.58, HFOV = 40.0 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.908 2 Lens 1 2.841 (ASP) 1.264Plastic 1.544 56.0 5.95 3 19.635 (ASP) 0.035 4 Lens 2 11.306 (ASP) 0.259Plastic 1.650 21.8 −14.43 5 5.078 (ASP) 0.428 6 Stop Plano 0.168 7 Lens3 11.034 (ASP) 0.313 Plastic 1.686 18.4 −54.15 8 8.409 (ASP) 0.101 9Stop Plano 0.054 10 Lens 4 79.224 (ASP) 0.618 Plastic 1.550 49.0 21.0311 −13.503 (ASP) 0.123 12 Lens 5 ∞ (ASP) 0.410 Plastic 1.544 56.0 194.5413 −105.836 (ASP) 0.569 14 Lens 6 −62.361 (ASP) 0.466 Plastic 1.559 40.4−15.18 15 9.845 (ASP) 0.051 16 Lens 7 2.208 (ASP) 0.539 Plastic 1.54456.0 7.02 17 4.786 (ASP) 1.160 18 Lens 8 −10.690 (ASP) 0.553 Plastic1.544 56.0 −5.90 19 4.666 (ASP) 0.450 20 IR-cut Filter Plano 0.210 Glass1.517 64.2 — 21 Plano 0.321 22 Image Plano 0.000 Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop 201(Surface 6) is 1.800 mm. An effective radius of the stop 202 (Surface 9)is 1.980 mm. An effective radius of the object-side surface 261 (Surface14) is 2.500 mm.

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 7 k =  5.4720E−035.2868E+00  5.9462E+00 3.1103E−01  1.0872E+01 A4 = −1.6425E−03−1.6114E−02  −1.9928E−02 −6.6451E−03  −2.1774E−02 A6 =  2.3585E−031.4588E−02  1.5089E−02 6.4721E−03 −7.5141E−03 A8 = −1.5689E−03−6.2291E−03  −5.1354E−03 −4.1564E−03   6.9861E−03 A10 =  6.3668E−041.3899E−03  8.3183E−04 2.2968E−03 −4.6910E−03 A12 = −1.5572E−04−1.4131E−04  −1.2176E−05 −7.0814E−04   1.4346E−03 A14 =  2.1748E−053.8695E−06 −4.0489E−06 9.5719E−05 −1.4856E−04 A16 = −1.4494E−06 — — — —Surface # 8 10 11 12 13 k =  6.9434E+00 0.0000E+00 2.7761E+01 0.0000E+002.9321E+01 A4 = −1.2543E−02 1.5868E−02 6.4401E−02 8.8360E−02 3.6623E−02A6 = −1.9225E−02 −3.8438E−02  −9.8805E−02  −1.1582E−01  −4.0316E−02  A8=  1.9039E−02 3.8107E−02 7.0408E−02 6.9777E−02 1.4267E−02 A10 =−1.0814E−02 −2.0612E−02  −2.8898E−02  −2.3942E−02  −8.9895E−04  A12 = 3.0119E−03 5.8434E−03 6.6987E−03 4.3434E−03 −1.0400E−03  A14 =−3.2384E−04 −8.0461E−04  −8.1795E−04  −3.5175E−04  3.4254E−04 A16 = 5.4063E−06 4.2587E−05 4.1594E−05 7.1215E−06 −4.1619E−05  A18 = — — — —1.7932E−06 Surface # 14 15 16 17 18 k = 0.0000E+00  2.1145E+00−1.0000E+00 0.0000E+00 0.0000E+00 A4 = 4.2289E−02 −2.6927E−02−4.1678E−02 3.4946E−02 −3.8270E−02  A6 = −2.7400E−02  −3.3306E−04 2.9611E−03 −2.9271E−02  2.0882E−03 A8 = 8.8060E−03  4.7378E−03−1.6791E−03 7.9017E−03 3.5181E−04 A10 = −2.5439E−03  −3.9829E−03−3.8033E−06 −1.3345E−03  4.2782E−07 A12 = 6.2218E−04  1.5816E−03 1.9829E−04 1.5571E−04 −9.8171E−06  A14 = −1.0614E−04  −3.4606E−04−5.3889E−05 −1.2936E−05  1.2369E−06 A16 = 9.8176E−06  4.2986E−05 6.2934E−06 7.3673E−07 −7.0336E−08  A18 = −3.5336E−07  −2.8463E−06−3.4691E−07 −2.5174E−08  1.9949E−09 A20 = —  7.8081E−08  7.3577E−093.7763E−10 −2.2977E−11  Surface # 19 k = −7.8182E−01 A4 = −3.9717E−02 A6=  5.3102E−03 A8 = −7.0552E−04 A10 =  7.9120E−05 A12 = −5.4382E−06 A14 = 1.7289E−07 A16 =  2.7955E−10 A18 = −1.5217E−10 A20 =  2.6284E−12

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, except for the Yc411, Yc412, Yc521, Yc522, Yc611 andYc612 mentioned in this embodiment, the definitions of these parametersshown in the following table are the same as those stated in the 1stembodiment with corresponding values for the 2nd embodiment, so anexplanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 6.66 Yc62 [mm] 1.04 Fno 1.58 Yc72 [mm] 1.83 HFOV[deg.] 40.0 Yc82 [mm] 1.38 Fno/tan(HFOV) 1.88 R14/R15 −0.45 V1/N1 36.26f/R12 + f/R14 + f/R16 3.49 V2/N2 13.21 f7/f8 −1.19 V3/N3 10.90 |f8/f1|0.99 V4/N4 31.61 |f8/f2| 0.41 V5/N5 36.26 |f8/f3| 0.11 V6/N6 25.95|f8/f4| 0.28 V7/N7 36.26 |f8/f5| 0.03 V8/N8 36.26 |f8/f6| 0.39 (V3 −V6)/(V3 + V6) −0.37 |f8/f7| 0.84 CT1/MaxCT28 2.05 |f/f1| 1.12 T78/T1233.14 |f/f2| 0.46 T78/T23 1.95 |f/f3| 0.12 T78/T34 7.48 |f/f4| 0.32T78/T45 9.43 |f/f5| 0.03 T78/T56 2.04 |f/f6| 0.44 T78/T67 22.75 |f/f7|0.95 T78/(CT7 + CT8) 1.06 |f/f8| 1.13 T78/BL 1.18 f12/f345 0.30ΣAT/(T23 + T56 + T78) 1.16 f/f678 −0.45 Dr5r10/Dr11r16 0.58|Yc322/Yc321| 1.51 EPD/Dr5r10 2.60 |Yc412/Yc411| 1.64 TL/ImgH 1.42|Yc522/Yc521| 3.47 ImgH/BL 5.81 |Yc612/Yc611| 4.13

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 399. The photographing lensassembly includes, in order from an object side to an image side, a stop301, a first lens element 310, a second lens element 320, an aperturestop 300, a third lens element 330, a stop 302, a fourth lens element340, a fifth lens element 350, a sixth lens element 360, a seventh lenselement 370, an eighth lens element 380, an IR-cut filter 390 and animage surface 395. The photographing lens assembly includes eight lenselements (310, 320, 330, 340, 350, 360, 370 and 380) with no additionallens element disposed between each of the adjacent eight lens elements.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 321 being convex in a paraxial region thereof and animage-side surface 322 being concave in a paraxial region thereof. Thesecond lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with negative refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric. The object-side surface 331 of the third lens element 330 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 332 of the third lens element 330 hasthree inflection points and one critical point in an off-axis regionthereof.

The fourth lens element 340 with positive refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric. The object-side surface 341 of the fourth lens element 340 hasthree inflection points and one critical point in an off-axis regionthereof. The image-side surface 342 of the fourth lens element 340 hasone inflection point and one critical point in an off-axis regionthereof.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being concave in a paraxial region thereof andan image-side surface 352 being concave in a paraxial region thereof.The fifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric. The object-side surface 351 of the fifth lens element 350 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 352 of the fifth lens element 350 hasone inflection point and one critical point in an off-axis regionthereof.

The sixth lens element 360 with negative refractive power has anobject-side surface 361 being convex in a paraxial region thereof and animage-side surface 362 being concave in a paraxial region thereof. Thesixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric. The object-side surface 361 of the sixth lens element 360 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 362 of the sixth lens element 360 hasone inflection point and one critical point in an off-axis regionthereof.

The seventh lens element 370 with positive refractive power has anobject-side surface 371 being convex in a paraxial region thereof and animage-side surface 372 being concave in a paraxial region thereof. Theseventh lens element 370 is made of plastic material and has theobject-side surface 371 and the image-side surface 372 being bothaspheric. The object-side surface 371 of the seventh lens element 370has two inflection points and one critical point in an off-axis regionthereof. The image-side surface 372 of the seventh lens element 370 hastwo inflection points and one critical point in an off-axis regionthereof.

The eighth lens element 380 with negative refractive power has anobject-side surface 381 being convex in a paraxial region thereof and animage-side surface 382 being concave in a paraxial region thereof. Theeighth lens element 380 is made of plastic material and has theobject-side surface 381 and the image-side surface 382 being bothaspheric. The object-side surface 381 of the eighth lens element 380 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 382 of the eighth lens element 380 hastwo inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 390 is made of glass material and located between theeighth lens element 380 and the image surface 395, and will not affectthe focal length of the photographing lens assembly. The image sensor399 is disposed on or near the image surface 395 of the photographinglens assembly.

When a vertical distance between the critical point closest to theoptical axis on the object-side surface 381 of the eighth lens element380 and the optical axis is Yc811, and a vertical distance between thecritical point closest to a maximum effective radius position on theobject-side surface 381 of the eighth lens element 380 and the opticalaxis is Yc812, the following condition is satisfied:|Yc812/Yc811|=12.77.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 6.46 mm, Fno = 1.78, HFOV = 40.6 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Stop Plano −0.844 2 Lens 1 3.289 (ASP) 1.234 Plastic1.545 56.0 6.80 3 25.399 (ASP) 0.035 4 Lens 2 7.442 (ASP) 0.295 Plastic1.655 17.5 −21.97 5 4.828 (ASP) 0.223 6 Ape. Stop Plano 0.546 7 Lens 327.857 (ASP) 0.288 Plastic 1.655 17.5 −43.44 8 14.018 (ASP) 0.023 9 StopPlano 0.098 10 Lens 4 −185.687 (ASP) 0.622 Plastic 1.544 55.9 16.35 11−8.492 (ASP) 0.128 12 Lens 5 −71.936 (ASP) 0.400 Plastic 1.544 55.9−76.89 13 100.000 (ASP) 0.471 14 Lens 6 15.527 (ASP) 0.626 Plastic 1.55048.5 −16.09 15 5.556 (ASP) 0.072 16 Lens 7 2.184 (ASP) 0.557 Plastic1.544 55.9 6.27 17 5.536 (ASP) 1.104 18 Lens 8 43.170 (ASP) 0.566Plastic 1.534 55.9 −5.67 19 2.816 (ASP) 0.450 20 IR-cut Filter Plano0.210 Glass 1.517 64.2 — 21 Plano 0.357 22 Image Plano 0.000 Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop 301 (Surface 1) is 2.250 mm. An effective radius of the stop 302(Surface 9) is 1.900 mm. An effective radius of the object-side surface361 (Surface 14) is 2.500 mm.

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 7 k =  3.5499E−028.4220E+01 −1.1829E+01 −5.2971E+00 −7.0704E+01 A4 = −1.3739E−03−1.4006E−02  −2.1892E−02 −1.0387E−02 −2.2644E−02 A6 =  1.8512E−031.3010E−02  1.4881E−02  5.1849E−03 −7.1821E−03 A8 = −1.3982E−03−5.5770E−03  −5.2367E−03 −3.4064E−03  6.3214E−03 A10 =  6.0076E−041.2543E−03  7.5242E−04  1.9551E−03 −4.1481E−03 A12 = −1.4223E−04−1.4700E−04   7.7772E−06 −7.0422E−04  1.3440E−03 A14 =  1.7758E−057.1938E−06 −7.0072E−06  1.0431E−04 −1.5447E−04 A16 = −9.4495E−07 — — — —Surface # 8 10 11 12 13 k = −1.7005E+00 0.0000E+00 1.1553E+01 0.0000E+00−9.0000E+01 A4 = −1.3172E−02 1.3600E−02 5.9928E−02 8.3962E−02 3.4499E−02 A6 = −1.8067E−02 −3.6152E−02  −9.3969E−02  −1.1012E−01 −4.2740E−02 A8 =  1.7988E−02 3.5594E−02 6.5826E−02 6.5073E−02 1.8587E−02 A10 = −9.8263E−03 −1.8817E−02  −2.6418E−02  −2.1898E−02 −3.7023E−03 A12 =  2.6935E−03 5.2419E−03 5.9990E−03 3.8943E−03−5.5741E−05 A14 = −2.8856E−04 −7.0951E−04  −7.1854E−04  −3.0933E−04  1.4562E−04 A16 =  3.6319E−06 3.6943E−05 3.6767E−05 5.9537E−06−2.1607E−05 A18 = — — — —  1.0040E−06 Surface # 14 15 16 17 18 k =0.0000E+00 −1.4183E+01 −1.0000E+00 0.0000E+00 0.0000E+00 A4 = 1.2613E−02−5.9007E−02 −5.2477E−02 3.4483E−02 −6.8533E−02  A6 = −1.1667E−02  2.1006E−02  1.4360E−02 −2.2729E−02  8.5322E−03 A8 = 1.4150E−03−6.7581E−03 −7.3962E−03 5.5508E−03 5.9449E−04 A10 = 7.5484E−04 9.6601E−04  2.1060E−03 −8.8198E−04  −2.6426E−04  A12 = −3.6001E−04  1.6745E−04 −3.6061E−04 9.6051E−05 3.2119E−05 A14 = 6.4517E−05−9.4777E−05  3.6224E−05 −6.9966E−06  −2.1049E−06  A16 = −5.9144E−06  1.6132E−05 −1.8511E−06 3.1937E−07 8.0089E−08 A18 = 2.4121E−07−1.2546E−06  3.0798E−08 −7.9928E−09  −1.6694E−09  A20 = —  3.7669E−08 3.7561E−10 7.9227E−11 1.4793E−11 Surface # 19 k = −8.0930E−01 A4 =−6.8066E−02 A6 =  1.3917E−02 A8 = −2.2089E−03 A10 =  2.3940E−04 A12 =−1.6918E−05 A14 =  7.6339E−07 A16 = −2.1198E−08 A18 =  3.3113E−10 A20 =−2.2448E−12

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, except for the Yc811 and Yc812 mentioned in thisembodiment, the definitions of these parameters shown in the followingtable are the same as those stated in the 1st and 2nd embodiments withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 6.46 ImgH/BL 5.60 Fno 1.78 Yc62 [mm] 0.99 HFOV[deg.] 40.6 Yc72 [mm] 2.01 Fno/tan(HFOV) 2.08 Yc82 [mm] 1.62 V1/N1 36.27R14/R15 0.13 V2/N2 10.57 f/R12 + f/R14 + f/R16 4.62 V3/N3 10.57 f7/f8−1.11 V4/N4 36.23 |f8/f1| 0.83 V5/N5 36.23 |f8/f2| 0.26 V6/N6 31.29|f8/f3| 0.13 V7/N7 36.23 |f8/f4| 0.35 V8/N8 36.46 |f8/f5| 0.07 (V3 −V6)/(V3 + V6) −0.47 |f8/f6| 0.35 CT1/MaxCT28 1.97 |f8/f7| 0.90 T78/T1231.54 |f/f1| 0.95 T78/T23 1.44 |f/f2| 0.29 T78/T34 9.12 |f/f3| 0.15T78/T45 8.63 |f/f4| 0.39 T78/T56 2.34 |f/f5| 0.08 T78/T67 15.33 |f/f6|0.40 T78/(CT7 + CT8) 0.98 |f/f7| 1.03 T78/BL 1.09 |f/f8| 1.14 ΣAT/(T23 +T56 + T78) 1.15 f12/f345 0.23 Dr5r10/Dr11r16 0.53 f/f678 −0.29EPD/Dr5r10 2.33 |Yc512/Yc511| 4.83 TL/ImgH 1.46 |Yc812/Yc811| 12.77

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 499. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 400, a first lens element 410, a second lens element 420,a stop 401, a third lens element 430, a stop 402, a fourth lens element440, a stop 403, a fifth lens element 450, a sixth lens element 460, aseventh lens element 470, an eighth lens element 480, an IR-cut filter490 and an image surface 495. The photographing lens assembly includeseight lens elements (410, 420, 430, 440, 450, 460, 470 and 480) with noadditional lens element disposed between each of the adjacent eight lenselements.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric. The object-side surface 411 of the first lens element 410 hasone inflection point. The image-side surface 412 of the first lenselement 410 has one inflection point and one critical point in anoff-axis region thereof.

The second lens element 420 with negative refractive power has anobject-side surface 421 being convex in a paraxial region thereof and animage-side surface 422 being concave in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with negative refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being concave in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric. The object-side surface 431 of the third lens element 430 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 432 of the third lens element 430 hastwo inflection points and two critical points in an off-axis regionthereof.

The fourth lens element 440 with positive refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric. The object-side surface 441 of the fourth lens element 440 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 442 of the fourth lens element 440 hastwo inflection points and one critical point in an off-axis regionthereof.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being concave in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric. The object-side surface 451 of the fifth lens element 450 hasthree inflection points and one critical point in an off-axis regionthereof. The image-side surface 452 of the fifth lens element 450 hasfour inflection points and one critical point in an off-axis regionthereof.

The sixth lens element 460 with negative refractive power has anobject-side surface 461 being convex in a paraxial region thereof and animage-side surface 462 being concave in a paraxial region thereof. Thesixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric. The object-side surface 461 of the sixth lens element 460 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 462 of the sixth lens element 460 hastwo inflection points and one critical point in an off-axis regionthereof.

The seventh lens element 470 with positive refractive power has anobject-side surface 471 being convex in a paraxial region thereof and animage-side surface 472 being concave in a paraxial region thereof. Theseventh lens element 470 is made of plastic material and has theobject-side surface 471 and the image-side surface 472 being bothaspheric. The object-side surface 471 of the seventh lens element 470has three inflection points and two critical points in an off-axisregion thereof. The image-side surface 472 of the seventh lens element470 has three inflection points and two critical points in an off-axisregion thereof.

The eighth lens element 480 with negative refractive power has anobject-side surface 481 being concave in a paraxial region thereof andan image-side surface 482 being concave in a paraxial region thereof.The eighth lens element 480 is made of plastic material and has theobject-side surface 481 and the image-side surface 482 being bothaspheric. The object-side surface 481 of the eighth lens element 480 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 482 of the eighth lens element 480 hasthree inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 490 is made of glass material and located between theeighth lens element 480 and the image surface 495, and will not affectthe focal length of the photographing lens assembly. The image sensor499 is disposed on or near the image surface 495 of the photographinglens assembly.

When a vertical distance between the critical point closest to theoptical axis on the object-side surface 471 of the seventh lens element470 and the optical axis is Yc711, and a vertical distance between thecritical point closest to a maximum effective radius position on theobject-side surface 471 of the seventh lens element 470 and the opticalaxis is Yc712, the following condition is satisfied: |Yc712/Yc711|=2.22.

When a vertical distance between the critical point closest to theoptical axis on the image-side surface 472 of the seventh lens element470 and the optical axis is Yc721, and a vertical distance between thecritical point closest to a maximum effective radius position on theimage-side surface 472 of the seventh lens element 470 and the opticalaxis is Yc722, the following condition is satisfied: |Yc722/Yc721|=2.21.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 6.77 mm, Fno = 1.70, HFOV = 41.0 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.924 2 Lens 1 2.566 (ASP) 1.166Plastic 1.545 56.1 5.64 3 13.033 (ASP) 0.057 4 Lens 2 12.834 (ASP) 0.300Plastic 1.686 18.4 −15.55 5 5.770 (ASP) 0.382 6 Stop Plano 0.123 7 Lens3 19.077 (ASP) 0.320 Plastic 1.686 18.4 −135.77 8 15.726 (ASP) −0.005 9Stop Plano 0.106 10 Lens 4 −21.605 (ASP) 0.491 Plastic 1.544 56.0 126.1011 −16.563 (ASP) −0.152 12 Stop Plano 0.257 13 Lens 5 19.016 (ASP) 0.430Plastic 1.544 56.0 61.72 14 43.498 (ASP) 0.564 15 Lens 6 9.638 (ASP)0.440 Plastic 1.566 37.4 −29.75 16 6.028 (ASP) 0.293 17 Lens 7 2.938(ASP) 0.568 Plastic 1.544 56.0 9.52 18 6.326 (ASP) 0.896 19 Lens 8−11.758 (ASP) 0.646 Plastic 1.534 55.9 −5.67 20 4.150 (ASP) 0.500 21IR-cut Filter Plano 0.210 Glass 1.517 64.2 — 22 Plano 0.250 23 ImagePlano 0.000 Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 401 (Surface 6) is 1.611 mm. An effectiveradius of the stop 402 (Surface 9) is 1.750 mm. An effective radius ofthe stop 403 (Surface 12) is 2.088 mm.

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 7 k = −5.2225E−01−8.2028E+01  4.0679E+01 8.7310E+00  3.6049E+01 A4 =  2.4131E−03−1.3979E−02 −2.3603E−02 −1.1472E−02  −3.0660E−02 A6 =  4.6246E−03 1.5929E−02  2.5007E−02 1.3236E−02  1.0129E−03 A8 = −4.3458E−03−6.1078E−03 −1.2275E−02 −8.7628E−03  −2.9842E−04 A10 =  2.7212E−03 2.2296E−04  3.1805E−03 3.9272E−03 −1.0596E−03 A12 = −9.5217E−04 5.4301E−04 −2.7491E−04 −1.0376E−03   1.1155E−03 A14 =  1.7829E−04−1.5312E−04 −1.5772E−05 1.5496E−04 −2.8072E−04 A16 = −1.4348E−05 1.2309E−05  2.7562E−06 —  1.6309E−05 Surface # 8 10 11 13 14 k = 2.9000E+01 3.3276E+01  3.6000E+01 −5.8231E+01 7.0959E+01 A4 =−1.0066E−02 3.9439E−02  5.3121E−02  3.9976E−02 2.4130E−03 A6 =−4.2986E−02 −9.9579E−02  −1.1178E−01 −1.0231E−01 −2.5678E−02  A8 = 6.6479E−02 1.4611E−01  1.0919E−01  8.3369E−02 1.0797E−02 A10 =−6.4441E−02 −1.3714E−01  −6.0600E−02 −3.6958E−02 8.6148E−05 A12 = 3.6303E−02 7.6070E−02  1.6231E−02  6.9150E−03 −2.0586E−03  A14 =−1.1137E−02 −2.4089E−02  −2.3948E−04  6.2921E−04 8.8541E−04 A16 = 1.7414E−03 4.0552E−03 −1.0062E−03 −5.0812E−04 −1.6837E−04  A18 =−1.0858E−04 −2.8232E−04   2.3879E−04  8.2807E−05 1.5269E−05 A20 = — —−1.7995E−05 −4.6804E−06 −5.3657E−07  Surface # 15 16 17 18 19 k = 2.5110E−01 −9.9000E+01 −1.2331E+00 −1.6044E+01  4.4442E+00 A4 =−1.6966E−02 −1.7617E−02 −4.0733E−02  1.4666E−02 −4.8623E−02 A6 = 4.2979E−03 −5.5215E−04  8.2887E−03 −1.2815E−02  9.6165E−03 A8 =−5.2864E−03  8.0386E−04 −4.4793E−03  3.2114E−03 −1.1311E−03 A10 = 2.4524E−03 −4.9758E−04  1.4751E−03 −4.9936E−04  1.0943E−04 A12 =−7.3081E−04  1.5321E−04 −2.9456E−04  4.8773E−05 −8.3371E−06 A14 = 1.4720E−04 −2.3201E−05  3.5953E−05 −2.9651E−06  4.4170E−07 A16 =−1.9493E−05  1.8169E−06 −2.5697E−06  1.1191E−07 −1.4758E−08 A18 = 1.5261E−06 −7.0795E−08  9.8204E−08 −2.4685E−09  2.7757E−10 A20 =−5.2154E−08  1.0853E−09 −1.5477E−09  2.4482E−11 −2.2403E−12 Surface # 20k = −4.5915E−01 A4 = −5.1206E−02 A6 =  1.0506E−02 A8 = −1.7252E−03 A10 = 1.9325E−04 A12 = −1.3918E−05 A14 =  6.2125E−07 A16 = −1.6366E−08 A18 = 2.2995E−10 A20 = −1.3095E−12

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, except for the Yc711, Yc712, Yc721 and Yc722 mentionedin this embodiment, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st to 3rdembodiments with corresponding values for the 4th embodiment, so anexplanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 6.77 Yc62 [mm] 1.08 Fno 1.70 Yc72 [mm] 1.71/3.81HFOV [deg.] 41.0 Yc82 [mm] 1.45 Fno/tan(HFOV) 1.95 R14/R15 −0.54 V1/N136.30 f/R12 + f/R14 + f/R16 3.83 V2/N2 10.90 f7/f8 −1.68 V3/N3 10.90|f8/f1| 1.00 V4/N4 36.26 |f8/f2| 0.36 V5/N5 36.26 |f8/f3| 0.04 V6/N623.91 |f8/f4| 0.04 V7/N7 36.26 |f8/f5| 0.09 V8/N8 36.46 |f8/f6| 0.19 (V3− V6)/(V3 + V6) −0.34 |f8/f7| 0.60 CT1/MaxCT28 1.80 |f/f1| 1.20 T78/T1215.72 |f/f2| 0.44 T78/T23 1.77 |f/f3| 0.05 T78/T34 8.87 |f/f4| 0.05T78/T45 8.53 |f/f5| 0.11 T78/T56 1.59 |f/f6| 0.23 T78/T67 3.06 |f/f7|0.71 T78/(CT7 + CT8) 0.74 |f/f8| 1.20 T78/BL 0.93 f12/f345 0.13ΣAT/(T23 + T56 + T78) 1.28 f/f678 −0.55 Dr5r10/Dr11r16 0.51|Yc322/Yc321| 1.93 EPD/Dr5r10 2.75 |Yc712/Yc711| 2.22 TL/ImgH 1.30|Yc722/Yc721| 2.21 ImgH/BL 6.27 — —

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 599. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 500, a first lens element 510, a second lens element 520,a stop 501, a third lens element 530, a stop 502, a fourth lens element540, a fifth lens element 550, a sixth lens element 560, a seventh lenselement 570, an eighth lens element 580, an IR-cut filter 590 and animage surface 595. The photographing lens assembly includes eight lenselements (510, 520, 530, 540, 550, 560, 570 and 580) with no additionallens element disposed between each of the adjacent eight lens elements.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being concave in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric. The object-side surface 511 of the first lens element 510 hasone inflection point. The image-side surface 512 of the first lenselement 510 has one inflection point and one critical point in anoff-axis region thereof.

The second lens element 520 with negative refractive power has anobject-side surface 521 being convex in a paraxial region thereof and animage-side surface 522 being concave in a paraxial region thereof. Thesecond lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with negative refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric. The object-side surface 531 of the third lens element 530 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 532 of the third lens element 530 hasthree inflection points and two critical points in an off-axis regionthereof.

The fourth lens element 540 with positive refractive power has anobject-side surface 541 being convex in a paraxial region thereof and animage-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric. The object-side surface 541 of the fourth lens element 540 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 542 of the fourth lens element 540 hasone inflection point and one critical point in an off-axis regionthereof.

The fifth lens element 550 with negative refractive power has anobject-side surface 551 being concave in a paraxial region thereof andan image-side surface 552 being convex in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric. The object-side surface 551 of the fifth lens element 550 hasfourth inflection points. The image-side surface 552 of the fifth lenselement 550 has two inflection points.

The sixth lens element 560 with negative refractive power has anobject-side surface 561 being convex in a paraxial region thereof and animage-side surface 562 being concave in a paraxial region thereof. Thesixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric. The object-side surface 561 of the sixth lens element 560 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 562 of the sixth lens element 560 hasthree inflection points and one critical point in an off-axis regionthereof.

The seventh lens element 570 with positive refractive power has anobject-side surface 571 being convex in a paraxial region thereof and animage-side surface 572 being concave in a paraxial region thereof. Theseventh lens element 570 is made of plastic material and has theobject-side surface 571 and the image-side surface 572 being bothaspheric. The object-side surface 571 of the seventh lens element 570has two inflection points and one critical point in an off-axis regionthereof. The image-side surface 572 of the seventh lens element 570 hastwo inflection points and one critical point in an off-axis regionthereof.

The eighth lens element 580 with negative refractive power has anobject-side surface 581 being concave in a paraxial region thereof andan image-side surface 582 being concave in a paraxial region thereof.The eighth lens element 580 is made of plastic material and has theobject-side surface 581 and the image-side surface 582 being bothaspheric. The object-side surface 581 of the eighth lens element 580 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 582 of the eighth lens element 580 hastwo inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 590 is made of glass material and located between theeighth lens element 580 and the image surface 595, and will not affectthe focal length of the photographing lens assembly. The image sensor599 is disposed on or near the image surface 595 of the photographinglens assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 6.84 mm, Fno = 1.53, HFOV = 38.9 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −1.029 2 Lens 1 2.839 (ASP) 1.450Plastic 1.545 56.1 6.03 3 17.112 (ASP) 0.035 4 Lens 2 12.624 (ASP) 0.320Plastic 1.669 19.4 −14.69 5 5.470 (ASP) 0.383 6 Stop Plano 0.085 7 Lens3 7.392 (ASP) 0.350 Plastic 1.669 19.4 −107.22 8 6.574 (ASP) 0.152 9Stop Plano 0.050 10 Lens 4 221.507 (ASP) 0.575 Plastic 1.544 56.0 15.7111 −8.879 (ASP) 0.136 12 Lens 5 −14.355 (ASP) 0.399 Plastic 1.561 38.7−66.74 13 −23.505 (ASP) 0.576 14 Lens 6 26.399 (ASP) 0.435 Plastic 1.56938.8 −10.22 15 4.734 (ASP) 0.090 16 Lens 7 2.217 (ASP) 0.551 Plastic1.547 51.6 5.82 17 6.649 (ASP) 1.019 18 Lens 8 −6.789 (ASP) 0.535Plastic 1.544 56.0 −5.37 19 5.273 (ASP) 0.450 20 IR-cut Filter Plano0.210 Glass 1.517 64.2 — 21 Plano 0.284 22 Image Plano 0.000 Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop 501 (Surface 6) is 1.770 mm. An effective radius of the stop 502(Surface 9) is 1.980 mm.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 7 k =  1.3472E−03−5.1991E+01 7.5250E+00 3.6022E−01  8.1426E+00 A4 = −1.7238E−03−1.6038E−02 −1.9028E−02  −5.9198E−03  −2.3060E−02 A6 =  1.9329E−03 1.4088E−02 1.4115E−02 5.4112E−03 −8.0136E−03 A8 = −1.2065E−03−5.7265E−03 −4.5578E−03  −3.0916E−03   7.1318E−03 A10 =  4.6668E−04 1.1992E−03 6.1855E−04 1.7284E−03 −4.6829E−03 A12 = −1.1389E−04−1.2153E−04 1.6060E−05 −5.7226E−04   1.4332E−03 A14 =  1.6654E−05 3.8996E−06 −5.6998E−06  8.6069E−05 −1.5061E−04 A16 = −1.1918E−06 — — —— Surface # 8 10 11 12 13 k =  5.5275E+00 0.0000E+00 −4.5785E−012.6677E+01 5.9644E+01 A4 = −1.2883E−02 1.5527E−02  6.6433E−02 9.0173E−023.5014E−02 A6 = −2.0355E−02 −3.8987E−02  −9.9762E−02 −1.1717E−01 −4.1017E−02  A8 =  1.9787E−02 3.8901E−02  7.2147E−02 7.1199E−021.4656E−02 A10 = −1.1310E−02 −2.1000E−02  −2.9727E−02 −2.4551E−02 −1.0937E−03  A12 =  3.2321E−03 5.9658E−03  6.9282E−03 4.5003E−03−9.8483E−04  A14 = −3.7214E−04 −8.2584E−04  −8.5371E−04 −3.6924E−04 3.3552E−04 A16 =  8.9917E−06 4.3988E−05  4.3810E−05 7.5766E−06−4.1007E−05  A18 = — — — — 1.7591E−06 Surface # 14 15 16 17 18 k =0.0000E+00 −4.5420E+01 −1.0000E+00 0.0000E+00  0.0000E+00 A4 =2.2621E−02 −2.6515E−02 −6.4412E−02 2.8901E−02 −5.0633E−02 A6 =−2.0224E−02   3.6110E−03  1.9742E−02 −1.9417E−02   1.2483E−02 A8 =7.2844E−03 −8.0941E−04 −1.0017E−02 2.7569E−03 −1.9279E−03 A10 =−2.1511E−03  −7.5198E−05  2.4873E−03 1.9552E−04  2.2050E−04 A12 =4.1899E−04  6.4382E−05 −2.6609E−04 −1.2442E−04  −1.7024E−05 A14 =−5.7559E−05  −1.3090E−05  1.9278E−06 1.8910E−05  8.2161E−07 A16 =5.0281E−06  1.6645E−06  2.0738E−06 −1.4380E−06  −2.2914E−08 A18 =−1.8752E−07  −1.2877E−07 −1.6624E−07 5.6012E−08  3.1676E−10 A20 = — 4.2058E−09  4.0632E−09 −8.8941E−10  −1.3905E−12 Surface # 19 k =−2.2440E+00 A4 = −5.0491E−02 A6 =  1.1482E−02 A8 = −1.9842E−03 A10 = 2.2972E−04 A12 = −1.6126E−05 A14 =  6.1816E−07 A16 = −9.7751E−09 A18 =−4.9733E−11 A20 =  2.3607E−12

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st to 4thembodiments with corresponding values for the 5th embodiment, so anexplanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 6.84 ImgH/BL 5.98 Fno 1.53 Yc62 [mm] 1.13 HFOV[deg.] 38.9 Yc72 [mm] 1.71 Fno/tan(HFOV) 1.89 Yc82 [mm] 1.19 V1/N1 36.30R14/R15 −0.98 V2/N2 11.62 f/R12 + f/R14 + f/R16 3.77 V3/N3 11.62 f7/f8−1.08 V4/N4 36.27 |f8/f1| 0.89 V5/N5 24.81 |f8/f2| 0.37 V6/N6 24.74|f8/f3| 0.05 V7/N7 33.33 |f8/f4| 0.34 V8/N8 36.27 |f8/f5| 0.08 (V3 −V6)/(V3 + V6) −0.33 |f8/f6| 0.53 CT1/MaxCT28 2.52 |f8/f7| 0.92 T78/T1229.11 |f/f1| 1.13 T78/T23 2.18 |f/f2| 0.47 T78/T34 5.04 |f/f3| 0.06T78/T45 7.49 |f/f4| 0.44 T78/T56 1.77 |f/f5| 0.10 T78/T67 11.32 |f/f6|0.67 T78/(CT7 + CT8) 0.94 |f/f7| 1.17 T78/BL 1.08 |f/f8| 1.27 ΣAT/(T23 +T56 + T78) 1.22 f12/f345 0.34 Dr5r10/Dr11r16 0.63 f/f678 −0.61EPD/Dr5r10 2.69 |Yc322/Yc321| 1.32 TL/ImgH 1.43 |Yc412/Yc411| 2.08

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 699. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 600, a first lens element 610, a second lens element 620,a stop 601, a third lens element 630, a fourth lens element 640, a stop602, a fifth lens element 650, a sixth lens element 660, a seventh lenselement 670, an eighth lens element 680, an IR-cut filter 690 and animage surface 695. The photographing lens assembly includes eight lenselements (610, 620, 630, 640, 650, 660, 670 and 680) with no additionallens element disposed between each of the adjacent eight lens elements.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric. The object-side surface 611 of the first lens element 610 hasone inflection point. The image-side surface 612 of the first lenselement 610 has one inflection point and one critical point in anoff-axis region thereof.

The second lens element 620 with negative refractive power has anobject-side surface 621 being convex in a paraxial region thereof and animage-side surface 622 being concave in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with negative refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric. The object-side surface 631 of the third lens element 630 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 632 of the third lens element 630 hastwo inflection points and two critical points in an off-axis regionthereof.

The fourth lens element 640 with positive refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being convex in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric. The object-side surface 641 of the fourth lens element 640 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 642 of the fourth lens element 640 hastwo inflection points and one critical point in an off-axis regionthereof.

The fifth lens element 650 with positive refractive power has anobject-side surface 651 being convex in a paraxial region thereof and animage-side surface 652 being concave in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric. The object-side surface 651 of the fifth lens element 650 hasthree inflection points and one critical point in an off-axis regionthereof. The image-side surface 652 of the fifth lens element 650 hastwo inflection points and one critical point in an off-axis regionthereof.

The sixth lens element 660 with negative refractive power has anobject-side surface 661 being convex in a paraxial region thereof and animage-side surface 662 being concave in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric. The object-side surface 661 of the sixth lens element 660 hasfour inflection points and one critical point in an off-axis regionthereof. The image-side surface 662 of the sixth lens element 660 hastwo inflection points and one critical point in an off-axis regionthereof.

The seventh lens element 670 with positive refractive power has anobject-side surface 671 being convex in a paraxial region thereof and animage-side surface 672 being concave in a paraxial region thereof. Theseventh lens element 670 is made of plastic material and has theobject-side surface 671 and the image-side surface 672 being bothaspheric. The object-side surface 671 of the seventh lens element 670has three inflection points and three critical points in an off-axisregion thereof. The image-side surface 672 of the seventh lens element670 has three inflection points and one critical point in an off-axisregion thereof.

The eighth lens element 680 with negative refractive power has anobject-side surface 681 being concave in a paraxial region thereof andan image-side surface 682 being concave in a paraxial region thereof.The eighth lens element 680 is made of plastic material and has theobject-side surface 681 and the image-side surface 682 being bothaspheric. The object-side surface 681 of the eighth lens element 680 hastwo inflection points and one critical point in an off-axis regionthereof. The image-side surface 682 of the eighth lens element 680 hasthree inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 690 is made of glass material and located between theeighth lens element 680 and the image surface 695, and will not affectthe focal length of the photographing lens assembly. The image sensor699 is disposed on or near the image surface 695 of the photographinglens assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 6.78 mm, Fno = 1.70, HFOV = 41.0 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.972 2 Lens 1 2.571 (ASP)1.184 Plastic 1.545 56.1 5.74 3 12.050 (ASP) 0.048 4 Lens 2 11.446 (ASP)0.300 Plastic 1.686 18.4 −16.24 5 5.586 (ASP) 0.378 6 Stop Plano 0.120 7Lens 3 15.679 (ASP) 0.320 Plastic 1.686 18.4 −172.63 8 13.731 (ASP)0.118 9 Lens 4 −18.105 (ASP) 0.520 Plastic 1.544 56.0 120.00 10 −14.318(ASP) −0.168 11 Stop Plano 0.248 12 Lens 5 17.778 (ASP) 0.434 Plastic1.544 56.0 48.81 13 53.314 (ASP) 0.614 14 Lens 6 9.946 (ASP) 0.446Plastic 1.566 37.4 −27.01 15 5.928 (ASP) 0.255 16 Lens 7 2.944 (ASP)0.548 Plastic 1.544 56.0 9.82 17 6.124 (ASP) 0.869 18 Lens 8 −11.942(ASP) 0.650 Plastic 1.534 55.9 −5.69 19 4.150 (ASP) 0.500 20 IR-cutFilter Plano 0.210 Glass 1.517 64.2 — 21 Plano 0.247 22 Image Plano0.000 Note: Reference wavelength is 587.6 nm (d-line). An effectiveradius of the stop 601 (Surface 6) is 1.608 mm. An effective radius ofthe image-side surface 632 (Surface 8) is 1.720 mm. An effective radiusof the stop 602 (Surface 11) is 2.121 mm.

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 7 k = −5.5277E−01−8.5643E+01  2.9350E+01 8.7158E+00  9.9768E+00 A4 =  2.9165E−03−1.7140E−02 −2.7607E−02 −1.2345E−02  −2.8953E−02 A6 =  4.2391E−03 1.9695E−02  2.8424E−02 1.2977E−02 −2.9499E−03 A8 = −4.1381E−03−8.0720E−03 −1.3998E−02 −8.7750E−03   3.4292E−03 A10 =  2.6826E−03 6.9623E−04  3.6490E−03 3.8703E−03 −3.9077E−03 A12 = −9.5648E−04 5.3165E−04 −3.2843E−04 −1.0166E−03   2.5120E−03 A14 =  1.8061E−04−1.6836E−04 −1.5306E−05 1.4978E−04 −6.3979E−04 A16 = −1.4489E−05 1.4194E−05  2.9486E−06 —  5.4755E−05 Surface # 8 9 10 12 13 k = 2.6052E+01 −2.4255E+01 3.5996E+01 −9.8224E+01 −9.0285E+01 A4 =−1.2637E−02  3.2998E−02 5.0963E−02  3.7295E−02 −1.9185E−03 A6 =−2.9335E−02 −6.9663E−02 −9.9621E−02  −9.6990E−02 −1.8165E−02 A8 = 4.1027E−02  9.8667E−02 8.9448E−02  7.9042E−02  5.6560E−03 A10 =−4.0761E−02 −9.5407E−02 −4.4399E−02  −3.7355E−02  1.7329E−03 A12 = 2.3790E−02  5.4554E−02 8.8781E−03  9.3968E−03 −2.1627E−03 A14 =−7.3896E−03 −1.7688E−02 1.6151E−03 −8.8430E−04  8.1230E−04 A16 = 1.1582E−03  3.0390E−03 −1.2416E−03  −7.9290E−05 −1.4853E−04 A18 =−7.2652E−05 −2.1562E−04 2.4792E−04  2.2379E−05  1.3304E−05 A20 = — —−1.7523E−05  −1.2568E−06 −4.6691E−07 Surface # 14 15 16 17 18 k = 4.1119E−01 −9.0125E+01 −1.2583E+00 −2.1605E+01  4.3954E+00 A4 =−1.5031E−02 −1.0016E−02 −3.0701E−02  2.8547E−02 −4.6242E−02 A6 = 8.4404E−03 −5.1566E−03 −9.2346E−04 −2.3998E−02  7.4894E−03 A8 =−1.0099E−02  3.2982E−03 −1.1426E−03  7.5122E−03 −5.3039E−04 A10 = 5.8187E−03 −1.1951E−03  9.4452E−04 −1.4946E−03  2.4972E−05 A12 =−2.1721E−03  2.2636E−04 −2.9585E−04  1.9357E−04 −1.4635E−06 A14 = 5.1552E−04 −2.0864E−05  4.7625E−05 −1.6208E−05  1.0154E−07 A16 =−7.4441E−05  6.9579E−07 −4.1053E−06  8.4792E−07 −4.6408E−09 A18 = 5.9043E−06  1.5001E−08  1.8061E−07 −2.5100E−08  1.1114E−10 A20 =−1.9482E−07 −1.0796E−09 −3.1963E−09  3.1875E−10 −1.0767E−12 Surface # 19k = −4.6164E−01 A4 = −5.1870E−02 A6 =  1.0299E−02 A8 = −1.6520E−03 A10 = 1.8722E−04 A12 = −1.4112E−05 A14 =  6.7780E−07 A16 = −1.9697E−08 A18 = 3.1380E−10 A20 = −2.0988E−12

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st to 5thembodiments with corresponding values for the 6th embodiment, so anexplanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 6.78 ImgH/BL 6.28 Fno 1.70 Yc62 [mm] 1.19 HFOV[deg.] 41.0 Yc72 [mm] 1.68 Fno/tan(HFOV) 1.95 Yc82 [mm] 1.42 V1/N1 36.30R14/R15 −0.51 V2/N2 10.90 f/R12 + f/R14 + f/R16 3.88 V3/N3 10.90 f7/f8−1.73 V4/N4 36.26 |f8/f1| 0.99 V5/N5 36.26 |f8/f2| 0.35 V6/N6 23.91|f8/f3| 0.03 V7/N7 36.26 |f8/f4| 0.05 V8/N8 36.46 |f8/f5| 0.12 (V3 −V6)/(V3 + V6) −0.34 |f8/f6| 0.21 CT1/MaxCT28 1.82 |f8/f7| 0.58 T78/T1218.10 |f/f1| 1.18 T78/T23 1.74 |f/f2| 0.42 T78/T34 7.36 |f/f3| 0.04T78/T45 10.86 |f/f4| 0.06 T78/T56 1.42 |f/f5| 0.14 T78/T67 3.41 |f/f6|0.25 T78/(CT7 + CT8) 0.73 |f/f7| 0.69 T78/BL 0.91 |f/f8| 1.19 ΣAT/(T23 +T56 + T78) 1.25 f12/f345 0.18 Dr5r10/Dr11r16 0.53 f/f678 −0.61EPD/Dr5r10 2.71 |Yc322/Yc321| 1.80 TL/ImgH 1.30 |Yc712/Yc711| 2.27

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 799. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 700, a first lens element 710, a second lens element 720,a stop 701, a third lens element 730, a stop 702, a fourth lens element740, a fifth lens element 750, a sixth lens element 760, a seventh lenselement 770, an eighth lens element 780, an IR-cut filter 790 and animage surface 795. The photographing lens assembly includes eight lenselements (710, 720, 730, 740, 750, 760, 770 and 780) with no additionallens element disposed between each of the adjacent eight lens elements.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being concave in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric. The object-side surface 711 of the first lens element 710 hasone inflection point. The image-side surface 712 of the first lenselement 710 has one inflection point.

The second lens element 720 with negative refractive power has anobject-side surface 721 being convex in a paraxial region thereof and animage-side surface 722 being concave in a paraxial region thereof. Thesecond lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with negative refractive power has anobject-side surface 731 being convex in a paraxial region thereof and animage-side surface 732 being concave in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric. The object-side surface 731 of the third lens element 730 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 732 of the third lens element 730 hasthree inflection points and two critical points in an off-axis regionthereof.

The fourth lens element 740 with negative refractive power has anobject-side surface 741 being convex in a paraxial region thereof and animage-side surface 742 being concave in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric. The object-side surface 741 of the fourth lens element 740 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 742 of the fourth lens element 740 hastwo inflection points and one critical point in an off-axis regionthereof.

The fifth lens element 750 with positive refractive power has anobject-side surface 751 being convex in a paraxial region thereof and animage-side surface 752 being convex in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric. The object-side surface 751 of the fifth lens element 750 hasthree inflection points and one critical point in an off-axis regionthereof. The image-side surface 752 of the fifth lens element 750 hasfour inflection points and two critical points in an off-axis regionthereof.

The sixth lens element 760 with negative refractive power has anobject-side surface 761 being concave in a paraxial region thereof andan image-side surface 762 being concave in a paraxial region thereof.The sixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric. The object-side surface 761 of the sixth lens element 760 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 762 of the sixth lens element 760 hasone inflection point and one critical point in an off-axis regionthereof.

The seventh lens element 770 with positive refractive power has anobject-side surface 771 being convex in a paraxial region thereof and animage-side surface 772 being concave in a paraxial region thereof. Theseventh lens element 770 is made of plastic material and has theobject-side surface 771 and the image-side surface 772 being bothaspheric. The object-side surface 771 of the seventh lens element 770has two inflection points and one critical point in an off-axis regionthereof. The image-side surface 772 of the seventh lens element 770 hastwo inflection points and one critical point in an off-axis regionthereof.

The eighth lens element 780 with negative refractive power has anobject-side surface 781 being concave in a paraxial region thereof andan image-side surface 782 being concave in a paraxial region thereof.The eighth lens element 780 is made of plastic material and has theobject-side surface 781 and the image-side surface 782 being bothaspheric. The object-side surface 781 of the eighth lens element 780 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 782 of the eighth lens element 780 hasthree inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 790 is made of glass material and located between theeighth lens element 780 and the image surface 795, and will not affectthe focal length of the photographing lens assembly. The image sensor799 is disposed on or near the image surface 795 of the photographinglens assembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 6.70 mm, Fno = 1.58, HFOV = 40.3 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.914 2 Lens 1 2.841 (ASP)1.304 Plastic 1.544 56.0 5.89 3 20.907 (ASP) 0.038 4 Lens 2 12.951 (ASP)0.250 Plastic 1.656 21.3 −15.19 5 5.589 (ASP) 0.455 6 Stop Plano 0.194 7Lens 3 13.835 (ASP) 0.250 Plastic 1.669 19.5 −77.24 8 10.834 (ASP) 0.0829 Stop Plano 0.040 10 Lens 4 271.105 (ASP) 0.615 Plastic 1.559 40.4−307.71 11 105.117 (ASP) 0.086 12 Lens 5 17.420 (ASP) 0.440 Plastic1.544 56.0 22.47 13 −40.611 (ASP) 0.485 14 Lens 6 −89.688 (ASP) 0.431Plastic 1.566 37.4 −13.30 15 8.231 (ASP) 0.122 16 Lens 7 2.152 (ASP)0.563 Plastic 1.553 47.5 6.80 17 4.563 (ASP) 1.208 18 Lens 8 −12.127(ASP) 0.550 Plastic 1.544 56.0 −6.19 19 4.734 (ASP) 0.450 20 IR-cutFilter Plano 0.210 Glass 1.517 64.2 — 21 Plano 0.319 22 Image Plano0.000 Note: Reference wavelength is 587.6 nm (d-line). An effectiveradius of the stop 701 (Surface 6) is 1.800 mm. An effective radius ofthe object-side surface 761 (Surface 14) is 2.430 mm.

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 7 k =  1.2025E−031.2336E+01  3.4726E+00 4.8386E−02  1.1951E+01 A4 = −1.6396E−03−1.6009E−02  −2.0143E−02 −6.9152E−03  −2.1885E−02 A6 =  2.4018E−031.4419E−02  1.5129E−02 6.4816E−03 −7.5208E−03 A8 = −1.5808E−03−6.2499E−03  −5.1503E−03 −4.1039E−03   6.9962E−03 A10 =  6.3648E−041.3875E−03  8.2981E−04 2.3081E−03 −4.6591E−03 A12 = −1.5492E−04−1.4069E−04  −1.2961E−05 −7.0678E−04   1.4433E−03 A14 =  2.1959E−053.7562E−06 −3.5012E−06 9.5001E−05 −1.5245E−04 A16 = −1.5587E−06 — — — —Surface # 8 10 11 12 13 k =  1.4359E+01 0.0000E+00 −9.0000E+010.0000E+00 −8.6995E+01 A4 = −1.0608E−02 1.6508E−02  5.9491E−028.7795E−02  3.9840E−02 A6 = −1.9046E−02 −3.8076E−02  −9.9538E−02−1.1516E−01  −4.0291E−02 A8 =  1.9077E−02 3.8166E−02  7.0406E−026.9752E−02  1.4298E−02 A10 = −1.0808E−02 −2.0610E−02  −2.8890E−02−2.3963E−02  −8.9125E−04 A12 =  3.0130E−03 5.8420E−03  6.7005E−034.3398E−03 −1.0396E−03 A14 = −3.2428E−04 −8.0474E−04  −8.1783E−04−3.5179E−04   3.4238E−04 A16 =  5.0550E−06 4.2473E−05  4.1571E−057.3097E−06 −4.1670E−05 A18 = — — — —  1.7978E−06 Surface # 14 15 16 1718 k = 0.0000E+00 1.5027E+00 −1.0000E+00 0.0000E+00  0.0000E+00 A4 =4.8214E−02 −3.4353E−02  −6.1036E−02 1.6088E−02 −4.2629E−02 A6 =−4.0153E−02  6.2833E−03  1.7715E−02 −2.0138E−02   6.0294E−03 A8 =1.8425E−02 1.0050E−03 −8.3794E−03 5.9465E−03 −1.4976E−03 A10 =−6.3534E−03  −1.6917E−03   2.7611E−03 −1.0754E−03   4.2605E−04 A12 =1.4503E−03 6.3081E−04 −5.8420E−04 1.2221E−04 −6.4039E−05 A14 =−2.0105E−04  −1.2460E−04   7.5022E−05 −8.5776E−06   5.3123E−06 A16 =1.4874E−05 1.4634E−05 −5.5487E−06 3.5916E−07 −2.5134E−07 A18 =−4.3673E−07  −9.7134E−07   2.1667E−07 −8.1131E−09   6.4051E−09 A20 = —2.7886E−08 −3.4645E−09 7.2942E−11 −6.8537E−11 Surface # 19 k =−5.4892E−01 A4 = −4.0208E−02 A6 =  6.4337E−03 A8 = −1.2425E−03 A10 = 1.9746E−04 A12 = −2.0298E−05 A14 =  1.2801E−06 A16 = −4.7698E−08 A18 = 9.5982E−10 A20 = −8.0070E−12

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st to 6thembodiments with corresponding values for the 7th embodiment, so anexplanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 6.70 Yc62 [mm] 1.14 Fno 1.58 Yc72 [mm] 1.85 HFOV[deg.] 40.3 Yc82 [mm] 1.39 Fno/tan(HFOV) 1.86 R14/R15 −0.38 V1/N1 36.26f/R12 + f/R14 + f/R16 3.70 V2/N2 12.84 f7/f8 −1.10 V3/N3 11.65 |f8/f1|1.05 V4/N4 25.95 |f8/f2| 0.41 V5/N5 36.26 |f8/f3| 0.08 V6/N6 23.91|f8/f4| 0.02 V7/N7 30.56 |f8/f5| 0.28 V8/N8 36.26 |f8/f6| 0.47 (V3 −V6)/(V3 + V6) −0.32 |f8/f7| 0.91 CT1/MaxCT28 2.12 |f/f1| 1.14 T78/T1231.79 |f/f2| 0.44 T78/T23 1.86 |f/f3| 0.09 T78/T34 9.90 |f/f4| 0.02T78/T45 14.05 |f/f5| 0.30 T78/T56 2.49 |f/f6| 0.50 T78/T67 9.90 |f/f7|0.99 T78/(CT7 + CT8) 1.09 |f/f8| 1.08 T78/BL 1.23 f12/f345 0.24ΣAT/(T23 + T56 + T78) 1.16 f/f678 −0.44 Dr5r10/Dr11r16 0.53|Yc322/Yc321| 1.60 EPD/Dr5r10 2.80 |Yc412/Yc411| 1.72 TL/ImgH 1.42|Yc522/Yc521| 1.93 ImgH/BL 5.82 |Yc612/Yc611| 5.26

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 899. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 800, a first lens element 810, a second lens element 820,a stop 801, a third lens element 830, a stop 802, a fourth lens element840, a fifth lens element 850, a sixth lens element 860, a seventh lenselement 870, an eighth lens element 880, an IR-cut filter 890 and animage surface 895. The photographing lens assembly includes eight lenselements (810, 820, 830, 840, 850, 860, 870 and 880) with no additionallens element disposed between each of the adjacent eight lens elements.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being concave in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric. The object-side surface 811 of the first lens element 810 hasone inflection point. The image-side surface 812 of the first lenselement 810 has one inflection point.

The second lens element 820 with negative refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being concave in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with negative refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being concave in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric. The object-side surface 831 of the third lens element 830 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 832 of the third lens element 830 hastwo inflection points and two critical points in an off-axis regionthereof.

The fourth lens element 840 with positive refractive power has anobject-side surface 841 being planar in a paraxial region thereof and animage-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric. The object-side surface 841 of the fourth lens element 840 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 842 of the fourth lens element 840 hasone inflection point.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being convex in a paraxial region thereof and animage-side surface 852 being concave in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric. The object-side surface 851 of the fifth lens element 850 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 852 of the fifth lens element 850 hasthree inflection points and one critical point in an off-axis regionthereof.

The sixth lens element 860 with positive refractive power has anobject-side surface 861 being convex in a paraxial region thereof and animage-side surface 862 being concave in a paraxial region thereof. Thesixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric. The object-side surface 861 of the sixth lens element 860 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 862 of the sixth lens element 860 hastwo inflection points and one critical point in an off-axis regionthereof.

The seventh lens element 870 with positive refractive power has anobject-side surface 871 being convex in a paraxial region thereof and animage-side surface 872 being concave in a paraxial region thereof. Theseventh lens element 870 is made of plastic material and has theobject-side surface 871 and the image-side surface 872 being bothaspheric. The object-side surface 871 of the seventh lens element 870has two inflection points and one critical point in an off-axis regionthereof. The image-side surface 872 of the seventh lens element 870 hastwo inflection points and one critical point in an off-axis regionthereof.

The eighth lens element 880 with negative refractive power has anobject-side surface 881 being concave in a paraxial region thereof andan image-side surface 882 being concave in a paraxial region thereof.The eighth lens element 880 is made of plastic material and has theobject-side surface 881 and the image-side surface 882 being bothaspheric. The object-side surface 881 of the eighth lens element 880 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 882 of the eighth lens element 880 hasthree inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 890 is made of glass material and located between theeighth lens element 880 and the image surface 895, and will not affectthe focal length of the photographing lens assembly. The image sensor899 is disposed on or near the image surface 895 of the photographinglens assembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 6.65 mm, Fno = 1.65, HFOV = 40.1 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.820 2 Lens 1 2.835 (ASP)1.184 Plastic 1.545 56.1 6.02 3 17.804 (ASP) 0.035 4 Lens 2 9.914 (ASP)0.300 Plastic 1.650 20.0 −16.88 5 5.146 (ASP) 0.437 6 Stop Plano 0.223 7Lens 3 16.610 (ASP) 0.311 Plastic 1.679 18.4 −53.44 8 11.309 (ASP) 0.0779 Stop Plano 0.077 10 Lens 4 ∞ (ASP) 0.621 Plastic 1.544 56.0 28.12 11−15.298 (ASP) 0.121 12 Lens 5 40.687 (ASP) 0.400 Plastic 1.555 46.0−119.40 13 25.121 (ASP) 0.397 14 Lens 6 26.933 (ASP) 0.536 Plastic 1.55546.0 235.16 15 33.695 (ASP) 0.163 16 Lens 7 2.681 (ASP) 0.526 Plastic1.544 56.0 11.08 17 4.496 (ASP) 1.075 18 Lens 8 −12.192 (ASP) 0.637Plastic 1.534 55.9 −5.76 19 4.187 (ASP) 0.450 20 IR-cut Filter Plano0.210 Glass 1.517 64.2 — 21 Plano 0.311 22 Image Plano 0.000 Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop 801 (Surface 6) is 1.800 mm. An effective radius of the stop 802(Surface 9) is 1.980 mm.

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 7 k =  1.4991E−027.9615E+00  3.6768E+00 1.3382E−01  1.7886E+01 A4 = −1.4245E−03−1.6097E−02  −2.0079E−02 −6.8773E−03  −2.1490E−02 A6 =  2.3396E−031.4517E−02  1.5008E−02 6.4890E−03 −7.5978E−03 A8 = −1.5826E−03−6.2478E−03  −5.1606E−03 −4.1447E−03   6.9569E−03 A10 =  6.3938E−041.3888E−03  8.4282E−04 2.2948E−03 −4.6608E−03 A12 = −1.5463E−04−1.4083E−04  −1.2188E−05 −7.0585E−04   1.4447E−03 A14 =  2.1858E−053.2842E−06 −3.8244E−06 9.6567E−05 −1.5213E−04 A16 = −1.6380E−06 — — — —Surface # 8 10 11 12 13 k =  1.0301E+01 0.0000E+00 −7.2815E+010.0000E+00 −9.0000E+01 A4 = −1.1518E−02 1.6537E−02  6.2116E−028.6859E−02  3.4946E−02 A6 = −1.9113E−02 −3.8282E−02  −9.9240E−02−1.1564E−01  −4.0556E−02 A8 =  1.9080E−02 3.8052E−02  7.0391E−026.9753E−02  1.4257E−02 A10 = −1.0813E−02 −2.0622E−02  −2.8902E−02−2.3951E−02  −8.9759E−04 A12 =  3.0129E−03 5.8433E−03  6.6988E−034.3419E−03 −1.0398E−03 A14 = −3.2422E−04 −8.0422E−04  −8.1813E−04−3.5178E−04   3.4251E−04 A16 =  5.5110E−06 4.2632E−05  4.1571E−057.2031E−06 −4.1629E−05 A18 = — — — —  1.7994E−06 Surface # 14 15 16 1718 k = 0.0000E+00  9.0000E+01 −1.0000E+00  0.0000E+00  0.0000E+00 A4 =1.0740E−02 −3.2275E−02 −2.5813E−02  2.0653E−02 −4.2164E−02 A6 =2.9219E−03  1.7984E−02 −3.8641E−03 −2.1548E−02  7.0165E−03 A8 =−1.1200E−02  −8.8735E−03  1.1017E−03  5.2698E−03 −1.9398E−03 A10 =6.1241E−03  2.0518E−03 −6.8258E−04 −7.3945E−04  5.0392E−04 A12 =−1.7376E−03  −8.1006E−05  2.9536E−04  5.8091E−05 −7.1329E−05 A14 =2.7483E−04 −6.6494E−05 −6.4250E−05 −1.8734E−06  5.7023E−06 A16 =−2.3079E−05   1.5507E−05  7.2690E−06 −4.2281E−08 −2.6300E−07 A18 =8.0940E−07 −1.4183E−06 −4.0842E−07  4.8064E−09  6.5748E−09 A20 = — 4.8398E−08  8.9700E−09 −1.0123E−10 −6.9286E−11 Surface # 19 k =−7.5089E−01 A4 = −4.3321E−02 A6 =  7.8962E−03 A8 = −1.5999E−03 A10 = 2.4883E−04 A12 = −2.4269E−05 A14 =  1.4224E−06 A16 = −4.8429E−08 A18 = 8.7479E−10 A20 = −6.3964E−12

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st to 7thembodiments with corresponding values for the 8th embodiment, so anexplanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 6.65 ImgH/BL 5.87 Fno 1.65 Yc62 [mm] 0.54 HFOV[deg.] 40.1 Yc72 [mm] 1.77 Fno/tan(HFOV) 1.96 Yc82 [mm] 1.48 V1/N1 36.30R14/R15 −0.37 V2/N2 12.12 f/R12 + f/R14 + f/R16 3.26 V3/N3 10.98 f7/f8−1.92 V4/N4 36.26 |f8/f1| 0.96 V5/N5 29.58 |f8/f2| 0.34 V6/N6 29.58|f8/f3| 0.11 V7/N7 36.26 |f8/f4| 0.20 V8/N8 36.46 |f8/f5| 0.05 (V3 −V6)/(V3 + V6) −0.43 |f8/f6| 0.02 CT1/MaxCT28 1.86 |f8/f7| 0.52 T78/T1230.71 |f/f1| 1.10 T78/T23 1.63 |f/f2| 0.39 T78/T34 6.98 |f/f3| 0.12T78/T45 8.88 |f/f4| 0.24 T78/T56 2.71 |f/f5| 0.06 T78/T67 6.60 |f/f6|0.03 T78/(CT7 + CT8) 0.92 |f/f7| 0.60 T78/BL 1.11 |f/f8| 1.15 ΣAT/(T23 +T56 + T78) 1.22 f12/f345 0.07 Dr5r10/Dr11r16 0.55 f/f678 −0.29EPD/Dr5r10 2.51 |Yc322/Yc321| 1.71 TL/ImgH 1.42 |Yc412/Yc411| 2.23

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 999. The photographing lensassembly includes, in order from an object side to an image side, a stop901, a first lens element 910, a second lens element 920, an aperturestop 900, a third lens element 930, a fourth lens element 940, a fifthlens element 950, a sixth lens element 960, a seventh lens element 970,a stop 902, an eighth lens element 980, an IR-cut filter 990 and animage surface 995. The photographing lens assembly includes eight lenselements (910, 920, 930, 940, 950, 960, 970 and 980) with no additionallens element disposed between each of the adjacent eight lens elements.

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being convex in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric. The object-side surface 911 of the first lens element 910 hasone inflection point. The image-side surface 912 of the first lenselement 910 has two inflection points and two critical points in anoff-axis region thereof.

The second lens element 920 with negative refractive power has anobject-side surface 921 being convex in a paraxial region thereof and animage-side surface 922 being concave in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric. The object-side surface 921 of the second lens element 920 hasone inflection point. The image-side surface 922 of the second lenselement 920 has one inflection point.

The third lens element 930 with negative refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being concave in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric. The object-side surface 931 of the third lens element 930 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 932 of the third lens element 930 hasthree inflection points and one critical point in an off-axis regionthereof.

The fourth lens element 940 with positive refractive power has anobject-side surface 941 being planar in a paraxial region thereof and animage-side surface 942 being convex in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric. The object-side surface 941 of the fourth lens element 940 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 942 of the fourth lens element 940 hasone inflection point and one critical point in an off-axis regionthereof.

The fifth lens element 950 with positive refractive power has anobject-side surface 951 being concave in a paraxial region thereof andan image-side surface 952 being convex in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric. The object-side surface 951 of the fifth lens element 950 hastwo inflection points. The object-side surface 951 of the fifth lenselement 950 has two critical points in an off-axis region thereof.

The sixth lens element 960 with negative refractive power has anobject-side surface 961 being convex in a paraxial region thereof and animage-side surface 962 being concave in a paraxial region thereof. Thesixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric. The object-side surface 961 of the sixth lens element 960 hasone inflection point and one critical point in an off-axis regionthereof. The image-side surface 962 of the sixth lens element 960 hasone inflection point and one critical point in an off-axis regionthereof.

The seventh lens element 970 with positive refractive power has anobject-side surface 971 being convex in a paraxial region thereof and animage-side surface 972 being concave in a paraxial region thereof. Theseventh lens element 970 is made of plastic material and has theobject-side surface 971 and the image-side surface 972 being bothaspheric. The object-side surface 971 of the seventh lens element 970has two inflection points and one critical point in an off-axis regionthereof. The image-side surface 972 of the seventh lens element 970 hastwo inflection points and one critical point in an off-axis regionthereof.

The eighth lens element 980 with negative refractive power has anobject-side surface 981 being convex in a paraxial region thereof and animage-side surface 982 being concave in a paraxial region thereof. Theeighth lens element 980 is made of plastic material and has theobject-side surface 981 and the image-side surface 982 being bothaspheric. The object-side surface 981 of the eighth lens element 980 hastwo inflection points and two critical points in an off-axis regionthereof. The image-side surface 982 of the eighth lens element 980 hastwo inflection points and one critical point in an off-axis regionthereof.

The IR-cut filter 990 is made of glass material and located between theeighth lens element 980 and the image surface 995, and will not affectthe focal length of the photographing lens assembly. The image sensor999 is disposed on or near the image surface 995 of the photographinglens assembly.

When a vertical distance between the critical point closest to theoptical axis on the image-side surface 912 of the first lens element 910and the optical axis is Yc121, and a vertical distance between thecritical point closest to a maximum effective radius position on theimage-side surface 912 of the first lens element 910 and the opticalaxis is Yc122, the following condition is satisfied: |Yc122/Yc121|=2.06.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 6.24 mm, Fno = 1.80, HFOV = 41.5 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Stop Plano −0.724 2 Lens 1 3.762 (ASP) 1.185Plastic 1.544 56.0 6.69 3 −100.000 (ASP) 0.035 4 Lens 2 6.557 (ASP)0.291 Plastic 1.641 20.1 −16.89 5 4.013 (ASP) 0.217 6 Ape. Stop Plano0.485 7 Lens 3 17.071 (ASP) 0.298 Plastic 1.692 15.5 −45.46 8 10.987(ASP) 0.106 9 Lens 4 ∞ (ASP) 0.616 Plastic 1.544 56.0 15.38 10 −8.364(ASP) 0.128 11 Lens 5 −24.527 (ASP) 0.459 Plastic 1.544 56.0 698.50 12−23.192 (ASP) 0.482 13 Lens 6 11.811 (ASP) 0.502 Plastic 1.554 45.0−13.63 14 4.536 (ASP) 0.107 15 Lens 7 2.048 (ASP) 0.552 Plastic 1.54456.0 5.91 16 5.111 (ASP) −0.148 17 Stop Plano 1.392 18 Lens 8 58.994(ASP) 0.530 Plastic 1.548 51.3 −5.60 19 2.908 (ASP) 0.450 20 IR-cutFilter Plano 0.210 Glass 1.517 64.2 — 21 Plano 0.356 22 Image Plano0.000 Note: Reference wavelength is 587.6 nm (d-line). An effectiveradius of the stop 901 (Surface 1) is 2.350 mm. An effective radius ofthe stop 902 (Surface 17) is 3.650 mm.

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 7 k = −1.1022E−01−9.0000E+01 −1.0180E+01 −8.8543E+00 −4.2969E+01 A4 = −1.1174E−03−9.6499E−04 −2.1673E−02 −1.2664E−02 −2.1308E−02 A6 =  1.4818E−03 4.8638E−03  1.2440E−02  4.7385E−03 −6.3858E−03 A8 = −1.2027E−03−2.2415E−03 −4.5825E−03 −2.9966E−03  5.3949E−03 A10 =  5.1315E−04 4.5538E−04  6.6504E−04  1.4864E−03 −3.4519E−03 A12 = −1.1525E−04−4.5805E−05  1.2982E−05 −5.3572E−04  1.1026E−03 A14 =  1.3236E−05 1.7544E−06 −6.9872E−06  8.8802E−05 −1.2174E−04 A16 = −6.5011E−07 — — —— Surface # 8 9 10 11 12 k = −5.9622E+00 0.0000E+00 1.0847E+010.0000E+00 5.2421E+01 A4 = −1.2736E−02 1.2324E−02 5.6607E−02 7.9060E−023.3710E−02 A6 = −1.6353E−02 −3.2657E−02  −8.5056E−02  −9.9559E−02 −3.9375E−02  A8 =  1.5734E−02 3.1045E−02 5.7407E−02 5.6787E−021.5718E−02 A10 = −8.2027E−03 −1.5771E−02  −2.2146E−02  −1.8335E−02 −2.7650E−03  A12 =  2.1699E−03 4.2346E−03 4.8348E−03 3.1413E−03−9.9338E−05  A14 = −2.2446E−04 −5.5020E−04  −5.5701E−04  −2.4004E−04 1.1164E−04 A16 =  1.9627E−06 2.7158E−05 2.7651E−05 4.2558E−06−1.5023E−05  A18 = — — — — 6.5279E−07 Surface # 13 14 15 16 18 k =0.0000E+00 −8.7992E+00 −1.0000E+00 0.0000E+00 0.0000E+00 A4 = 1.4333E−02−6.5370E−02 −5.2992E−02 4.2008E−02 −6.3377E−02  A6 = −1.2390E−02  2.9611E−02  1.7075E−02 −2.3841E−02  7.4952E−03 A8 = 3.3486E−03−1.0087E−02 −8.4870E−03 4.8875E−03 4.6298E−04 A10 = −6.5530E−04  1.8637E−03  2.2645E−03 −5.4797E−04  −1.8359E−04  A12 = 9.3823E−05−7.2345E−05 −3.6075E−04 2.8785E−05 1.9185E−05 A14 = −9.4373E−06 −3.9823E−05  3.4772E−05 5.0495E−07 −1.0504E−06  A16 = 1.6867E−07 8.1783E−06 −1.8805E−06 −1.6462E−07  3.2082E−08 A18 = 3.4735E−08−6.4987E−07  4.8364E−08 8.8328E−09 −5.0109E−10  A20 = —  1.9305E−08−3.6954E−10 −1.6343E−10  2.8807E−12 Surface # 19 k = −7.5401E−01 A4 =−6.2862E−02 A6 =  1.1930E−02 A8 = −1.8682E−03 A10 =  2.1284E−04 A12 =−1.7302E−05 A14 =  9.8879E−07 A16 = −3.7402E−08 A18 =  8.2683E−10 A20 =−7.9810E−12

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, except for the Yc121 and Yc122 mentioned in thisembodiment, the definitions of these parameters shown in the followingtable are the same as those stated in the 1st to 8th embodiments withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 6.24 Yc62 [mm] 1.20 Fno 1.80 Yc72 [mm] 2.17 HFOV[deg.] 41.5 Yc82 [mm] 1.62 Fno/tan(HFOV) 2.03 R14/R15 0.09 V1/N1 36.27f/R12 + f/R14 + f/R16 4.74 V2/N2 12.25 f7/f8 −1.05 V3/N3 9.16 |f8/f1|0.84 V4/N4 36.27 |f8/f2| 0.33 V5/N5 36.27 |f8/f3| 0.12 V6/N6 28.93|f8/f4| 0.36 V7/N7 36.27 |f8/f5| 0.01 V8/N8 33.14 |f8/f6| 0.41 (V3 −V6)/(V3 + V6) −0.49 |f8/f7| 0.95 CT1/MaxCT28 1.92 |f/f1| 0.93 T78/T1235.54 |f/f2| 0.37 T78/T23 1.77 |f/f3| 0.14 T78/T34 11.74 |f/f4| 0.41T78/T45 9.72 |f/f5| 0.01 T78/T56 2.58 |f/f6| 0.46 T78/T67 11.63 |f/f7|1.06 T78/(CT7 + CT8) 1.15 |f/f8| 1.11 T78/BL 1.23 f12/f345 0.44ΣAT/(T23 + T56 + T78) 1.15 f/f678 −0.29 Dr5r10/Dr11r16 0.55|Yc122/Yc121| 2.06 EPD/Dr5r10 2.16 |Yc412/Yc411| 2.65 TL/ImgH 1.45|Yc512/Yc511| 2.06 ImgH/BL 5.61 |Yc812/Yc811| 14.27

10th Embodiment

FIG. 19 is a perspective view of an image capturing unit according tothe 10th embodiment of the present disclosure. In this embodiment, animage capturing unit 10 is a camera module including a lens unit 11, adriving device 12, an image sensor 13 and an image stabilizer 14. Thelens unit 11 includes the photographing lens assembly disclosed in the1st embodiment, a barrel and a holder member (their reference numeralsare omitted) for holding the photographing lens assembly. The imaginglight converges in the lens unit 11 of the image capturing unit 10 togenerate an image with the driving device 12 utilized for image focusingon the image sensor 13, and the generated image is then digitallytransmitted to other electronic component for further processing.

The driving device 12 can have auto focusing functionality, anddifferent driving configurations can be obtained through the usages ofvoice coil motors (VCM), micro electro-mechanical systems (MEMS),piezoelectric systems, or shape memory alloy materials. The drivingdevice 12 is favorable for obtaining a better imaging position of thelens unit 11, so that a clear image of the imaged object can be capturedby the lens unit 11 with different object distances. The image sensor 13(for example, CCD or CMOS), which can feature high photosensitivity andlow noise, is disposed on the image surface of the photographing lensassembly to provide higher image quality.

The image stabilizer 14, such as an accelerometer, a gyro sensor and aHall Effect sensor, is configured to work with the driving device 12 toprovide optical image stabilization (01S). The driving device 12 workingwith the image stabilizer 14 is favorable for compensating for pan andtilt of the lens unit 11 to reduce blurring associated with motionduring exposure. In some cases, the compensation can be provided byelectronic image stabilization (EIS) with image processing software,thereby improving image quality while in motion or low-light conditions.

11th Embodiment

FIG. 20 is a front view of an electronic device according to the 11thembodiment of the present disclosure.

In this embodiment, an electronic device 20 is a smartphone including animage capturing unit 21 and a display unit 22. In this embodiment, theimage capturing unit 21 includes the photographing lens assemblydisclosed in the 1st embodiment and an image sensor (their referencenumbers are omitted). In FIG. 20, the image capturing unit 21 and thedisplay unit 22 are all disposed on one side of the electronic device20. The image capturing unit 21 is a front-facing camera of theelectronic device 20 for taking selfies, but the present disclosure isnot limited thereto.

12th Embodiment

FIG. 21 is a rear view of an electronic device according to the 12thembodiment of the present disclosure.

In this embodiment, an electronic device 30 is a smartphone including animage capturing unit 31, an image capturing unit 32, an image capturingunit 33 and a display unit (its reference number is omitted). In thisembodiment, the image capturing units 31, 32 and 33 have differentfields of view (e.g., the image capturing unit 31 is a telephoto imagecapturing unit, the image capturing unit 32 is a standard imagecapturing unit and the image capturing unit 33 is a wide-angle imagecapturing unit), such that the electronic device 30 has variousmagnification ratios so as to meet the requirement of optical zoomfunctionality. The image capturing unit 32 includes the photographinglens assembly disclosed in the 4th embodiment and an image sensor (theirreference numbers are omitted). In this embodiment, the image capturingunit 31, 32 and 33 are all disposed on one side of the electronic device30, while the display unit is disposed on the opposite side of theelectronic device 30.

13th Embodiment

FIG. 22 is a rear view of an electronic device according to the 13thembodiment of the present disclosure.

In this embodiment, an electronic device 40 is a smartphone including animage capturing unit 41, an image capturing unit 42, an image capturingunit 43, an image capturing unit 44 and a display unit (its referencenumber is omitted). In this embodiment, the image capturing units 41, 4243 and 44 have different fields of view (e.g., the image capturing unit41 is a telephoto image capturing unit, the image capturing unit 42 is awide-angle image capturing unit, the image capturing unit 43 is astandard image capturing unit and the image capturing unit 44 is anultra-wide-angle image capturing unit), such that the electronic device40 has various magnification ratios so as to meet the requirement ofoptical zoom functionality. The image capturing unit 43 includes thephotographing lens assembly disclosed in the 4th embodiment and an imagesensor (their reference numbers are omitted). In this embodiment, theimage capturing unit 41, 42, 43 and 44 are all disposed on one side ofthe electronic device 40, while the display unit is disposed on theopposite side of the electronic device 40.

14th Embodiment

FIG. 23 is a rear view of an electronic device according to the 14thembodiment of the present disclosure.

In this embodiment, an electronic device 50 is a smartphone including animage capturing unit 51, an image capturing unit 52 and a display unit(its reference number is omitted). In this embodiment, the imagecapturing units 51 and 52 have different fields of view (e.g., the imagecapturing unit 51 is a wide-angle image capturing unit and the imagecapturing unit 52 is a standard image capturing unit), such that theelectronic device 50 has various magnification ratios so as to meet therequirement of optical zoom functionality. The image capturing unit 52includes the photographing lens assembly disclosed in the 4th embodimentand an image sensor (their reference numbers are omitted). In thisembodiment, the image capturing unit 51 and 52 are all disposed on oneside of the electronic device 50, while the display unit is disposed onthe opposite side of the electronic device 50.

The smartphone in this embodiment is only exemplary for showing theimage capturing units including the photographing lens assembly of thepresent disclosure installed in an electronic device, and the presentdisclosure is not limited thereto. The photographing lens assembly canbe optionally applied to systems with a movable focus. Furthermore, thephotographing lens assembly of the image capturing unit features goodcapability in aberration corrections and high image quality, and can beapplied to 3D (three-dimensional) image capturing applications, inproducts such as digital cameras, mobile devices, digital tablets, smarttelevisions, network surveillance devices, dashboard cameras, vehiclebackup cameras, multi-camera devices, image recognition systems, motionsensing input devices, wearable devices and other electronic imagingdevices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-18 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. A photographing lens assembly comprising eightlens elements, the eight lens elements being, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element, a sixthlens element, a seventh lens element and an eighth lens element; whereinthe first lens element with positive refractive power has an object-sidesurface being convex in a paraxial region thereof, the sixth lenselement has an image-side surface being concave in a paraxial regionthereof, the seventh lens element has an image-side surface beingconcave in a paraxial region thereof, the eighth lens element withnegative refractive power has an image-side surface being concave in aparaxial region thereof, and the image-side surface of the eighth lenselement has at least one critical point in an off-axis region thereof;wherein a central thickness of the first lens element is CT1, a maximumvalue among central thicknesses of the second through eighth lenselements is MaxCT28, a curvature radius of the image-side surface of theseventh lens element is R14, a curvature radius of an object-sidesurface of the eighth lens element is R15, an axial distance between anobject-side surface of the third lens element and an image-side surfaceof the fifth lens element is Dr5r10, an axial distance between anobject-side surface of the sixth lens element and the image-side surfaceof the eighth lens element is Dr11r16, and the following conditions aresatisfied:1.0<CT1/MaxCT28;R14/R15<1.20; andDr5r10/Dr11r16<0.90.
 2. The photographing lens assembly of claim 1,wherein each of object-side surfaces and image-side surfaces of thesixth through eighth lens elements has at least one critical point in anoff-axis region thereof.
 3. The photographing lens assembly of claim 1,wherein the central thickness of the first lens element is CT1, themaximum value among central thicknesses of the second through eighthlens elements is MaxCT28, and the following condition is satisfied:1.5<CT1/MaxCT28<3.5.
 4. The photographing lens assembly of claim 1,wherein the curvature radius of the image-side surface of the seventhlens element is R14, the curvature radius of the object-side surface ofthe eighth lens element is R15, and the following condition issatisfied:−2.5<R14/R15<0.50.
 5. The photographing lens assembly of claim 1,wherein the axial distance between the object-side surface of the thirdlens element and the image-side surface of the fifth lens element isDr5r10, the axial distance between the object-side surface of the sixthlens element and the image-side surface of the eighth lens element isDr11r16, and the following condition is satisfied:0.30<Dr5r10/Dr11r16<0.75.
 6. The photographing lens assembly of claim 1,wherein at least one lens surface of at least one lens element has atleast two critical points in an off-axis region thereof, a verticaldistance between a critical point closest to an optical axis of the atleast two critical points and the optical axis is Yc1, a verticaldistance between a critical point closest to a maximum effective radiusposition of the at least two critical points and the optical axis isYc2, and the following condition is satisfied:1.20<|Yc2/Yc1|<5.0.
 7. The photographing lens assembly of claim 1,wherein an axial distance between the seventh lens element and theeighth lens element is T78, a central thickness of the seventh lenselement is CT7, a central thickness of the eighth lens element is CT8,and the following condition is satisfied:0.40<T78/(CT7+CT8)<1.5.
 8. The photographing lens assembly of claim 1,wherein an axial distance between the first lens element and the secondlens element is T12, an axial distance between the second lens elementand the third lens element is T23, an axial distance between the thirdlens element and the fourth lens element is T34, an axial distancebetween the fourth lens element and the fifth lens element is T45, anaxial distance between the fifth lens element and the sixth lens elementis T56, an axial distance between the sixth lens element and the seventhlens element is T67, an axial distance between the seventh lens elementand the eighth lens element is T78, an axial distance between theimage-side surface of the eighth lens element and an image surface isBL, and the following conditions are satisfied:1.0<T78/T12;1.0<T78/T23;1.0<T78/T34;1.0<T78/T45;1.0<T78/T56;1.10<T78/T67; and0.80<T78/BL.
 9. The photographing lens assembly of claim 1, wherein anAbbe number of the third lens element is V3, an Abbe number of the sixthlens element is V6, and the following condition is satisfied:−1.0<(V3−V6)/(V3+V6)<−0.30.
 10. The photographing lens assembly of claim1, wherein a vertical distance between a critical point on theimage-side surface of the sixth lens element and an optical axis isYc62, a vertical distance between a critical point on the image-sidesurface of the seventh lens element and the optical axis is Yc72, avertical distance between the critical point on the image-side surfaceof the eighth lens element and the optical axis is Yc82, and thefollowing condition is satisfied:Yc62<Yc82<Yc72.
 11. The photographing lens assembly of claim 1, whereinan entrance pupil diameter of the photographing lens assembly is EPD,the axial distance between the object-side surface of the third lenselement and the image-side surface of the fifth lens element is Dr5r10,and the following condition is satisfied:2.0<EPD/Dr5r10<4.0.
 12. The photographing lens assembly of claim 1,wherein a focal length of the photographing lens assembly is f, acurvature radius of the image-side surface of the sixth lens element isR12, the curvature radius of the image-side surface of the seventh lenselement is R14, a curvature radius of the image-side surface of theeighth lens element is R16, and the following condition is satisfied:3.0<f/R12+f/R14+f/R16<10.
 13. The photographing lens assembly of claim1, wherein an f-number of the photographing lens assembly is Fno, halfof a maximum field of view of the photographing lens assembly is HFOV,and the following condition is satisfied:Fno/tan(HFOV)<2.20.
 14. The photographing lens assembly of claim 1,wherein a sum of axial distances between each of all adjacent lenselements of the photographing lens assembly is ΣAT, an axial distancebetween the second lens element and the third lens element is T23, anaxial distance between the fifth lens element and the sixth lens elementis T56, an axial distance between the seventh lens element and theeighth lens element is T78, and the following condition is satisfied:1.0<ΣAT/(T23−FT56−FT78)<1.50.
 15. The photographing lens assembly ofclaim 1, wherein a focal length of the photographing lens assembly is f,a composite focal length of the first lens element and the second lenselement is f12, a composite focal length of the third lens element, thefourth lens element and the fifth lens element is f345, a compositefocal length of the sixth lens element, the seventh lens element and theeighth lens element is f678, and the following conditions are satisfied:0<f12/f345<1.50; andf/f678<−0.20.
 16. An image capturing unit, comprising: the photographinglens assembly of claim 1; and an image sensor disposed on an imagesurface of the photographing lens assembly.
 17. An electronic device,comprising: the image capturing unit of claim
 16. 18. A photographinglens assembly comprising eight lens elements, the eight lens elementsbeing, in order from an object side to an image side, a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element; wherein the first lens element withpositive refractive power has an object-side surface being convex in aparaxial region thereof, the sixth lens element has an image-sidesurface being concave in a paraxial region thereof, the seventh lenselement with positive refractive power has an object-side surface beingconvex in a paraxial region thereof and has an image-side surface beingconcave in a paraxial region thereof, the eighth lens element withnegative refractive power has an image-side surface being concave in aparaxial region thereof, and the image-side surface of the eighth lenselement has at least one critical point in an off-axis region thereof;wherein a central thickness of the first lens element is CT1, a maximumvalue among central thicknesses of the second through eighth lenselements is MaxCT28, a curvature radius of the image-side surface of theseventh lens element is R14, a curvature radius of an object-sidesurface of the eighth lens element is R15, an axial distance between anobject-side surface of the third lens element and an image-side surfaceof the fifth lens element is Dr5r10, an axial distance between anobject-side surface of the sixth lens element and the image-side surfaceof the eighth lens element is Dr11r16, and the following conditions aresatisfied:1.0<CT1/MaxCT28;R14/R15<1.20; andDr5r10/Dr11r16<1.0.
 19. The photographing lens assembly of claim 18,wherein a focal length of the photographing lens assembly is f, a focallength of the first lens element is f1, a focal length of the secondlens element is f2, a focal length of the third lens element is f3, afocal length of the fourth lens element is f4, a focal length of thefifth lens element is f5, a focal length of the sixth lens element isf6, a focal length of the seventh lens element is f7, a focal length ofthe eighth lens element is f8, a focal length of the i-th lens elementis fi, and at least one lens element of the photographing lens assemblysatisfies the following condition:|f/fi|<0.10, wherein i=1, 2, 3, 4, 5, 6, 7 or
 8. 20. The photographinglens assembly of claim 18, wherein a focal length of the seventh lenselement is f7, a focal length of the eighth lens element is f8, and thefollowing condition is satisfied:f7/f8<−0.50.
 21. The photographing lens assembly of claim 18, wherein anentrance pupil diameter of the photographing lens assembly is EPD, theaxial distance between the object-side surface of the third lens elementand the image-side surface of the fifth lens element is Dr5r10, and thefollowing condition is satisfied:2.0<EPD/Dr5r10<4.0.
 22. The photographing lens assembly of claim 18,wherein a sum of axial distances between each of all adjacent lenselements of the photographing lens assembly is ΣAT, an axial distancebetween the second lens element and the third lens element is T23, anaxial distance between the fifth lens element and the sixth lens elementis T56, an axial distance between the seventh lens element and theeighth lens element is T78, and the following condition is satisfied:1.0<ΣAT/(T23+T56+T78)<1.50.
 23. The photographing lens assembly of claim18, wherein an f-number of the photographing lens assembly is Fno, halfof a maximum field of view of the photographing lens assembly is HFOV,and the following condition is satisfied:Fno/tan(HFOV)<2.20.
 24. The photographing lens assembly of claim 18,wherein an axial distance between the seventh lens element and theeighth lens element is T78, a central thickness of the seventh lenselement is CT7, a central thickness of the eighth lens element is CTB,and the following condition is satisfied:0.40<T78/(CT7+CT8)<1.5.
 25. The photographing lens assembly of claim 18,wherein a focal length of the first lens element is f1, a focal lengthof the second lens element is f2, a focal length of the third lenselement is f3, a focal length of the fourth lens element is f4, a focallength of the fifth lens element is f5, a focal length of the sixth lenselement is f6, a focal length of the seventh lens element is f7, a focallength of the eighth lens element is f8, and the following conditionsare satisfied:|f8/f1|<1.0;|f8/f2|<1.0;|f8/f3|<1.0;|f8/f4|<1.0;|f8/f5|<1.0;|f8/f6|<1.0; and|f8/f7|<1.0.
 26. The photographing lens assembly of claim 18, wherein anAbbe number of the first lens element is V1, an Abbe number of thesecond lens element is V2, an Abbe number of the third lens element isV3, an Abbe number of the fourth lens element is V4, an Abbe number ofthe fifth lens element is V5, an Abbe number of the sixth lens elementis V6, an Abbe number of the seventh lens element is V7, an Abbe numberof the eighth lens element is V8, an Abbe number of the i-th lenselement is Vi, a refractive index of the first lens element is N1, arefractive index of the second lens element is N2, a refractive index ofthe third lens element is N3, a refractive index of the fourth lenselement is N4, a refractive index of the fifth lens element is N5, arefractive index of the sixth lens element is N6, a refractive index ofthe seventh lens element is N7, a refractive index of the eighth lenselement is N8, a refractive index of the i-th lens element is Ni, and atleast two lens elements of the photographing lens assembly satisfy thefollowing condition:5.0<Vi/Ni<12.0, wherein i=1, 2, 3, 4, 5, 6, 7 or
 8. 27. Thephotographing lens assembly of claim 18, wherein an axial distancebetween the object-side surface of the first lens element and an imagesurface is TL, a maximum image height of the photographing lens assemblyis ImgH, an axial distance between the image-side surface of the eighthlens element and the image surface is BL, and the following conditionsare satisfied:TL/ImgH<1.60; and5.0<ImgH/BL.
 28. The photographing lens assembly of claim 18, whereinthe curvature radius of the image-side surface of the seventh lenselement is R14, the curvature radius of the object-side surface of theeighth lens element is R15, and the following condition is satisfied:−2.5<R14/R15<0.50.
 29. The photographing lens assembly of claim 18,wherein at least one lens surface of the third through seventh lenselement has at least one inflection point.
 30. An image capturing unit,comprising: the photographing lens assembly of claim 18; and an imagesensor disposed on an image surface of the photographing lens assembly.31. An electronic device, comprising: the image capturing unit of claim30.